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Continuing the series of articles (... well actually is just the second one) on restricted combinatorial objects constrained by a recursively defined statistic and initiated by [this work](https://papers-gamma.link/paper/38/Dyck%20paths%20with%20a%20first%20return%20decomposition%20constrained%20by%20height) we submitted to review a new paper of subject.
Il y a Lukasuewicz à faire maintenant ... 😀
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[Rob Pike](http://www.herpolhode.com/rob/) complains about software systems research. A decade later he designed the [go](https://en.wikipedia.org/wiki/Go_(game) language together with Robert Griesemer and Ken Thompson.
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Well, apparently nobody knows how to enumerate directed animals according to the number of edges. It is an open question of combinatorics. The following table from "Directed Animals on Two Dimensional Lattices" article by A. R. Conway, R. Brak and A. J. Guttmann presents results for n<40 **Number of bond animals on the square lattice...** ``` 1 1 2 2 3 5 4 14 5 42 6 130 7 412 8 1326 9 4318 10 14188 11 46950 12 156258 13 522523 14 1754254 15 5909419 16 19964450 17 67618388 18 229526054 19 780633253 20 2659600616 21 9075301990 22 31010850632 23 106100239080 24 363428599306 25 1246172974048 26 4277163883744 27 14693260749888 28 50516757992258 29 173812617499767 30 598455761148888 31 2061895016795926 32 7108299669877836 33 24519543126693604 34 84623480620967174 35 292204621065844292 36 1009457489428859322 37 3488847073597306764 38 12063072821044567580 39 41725940730851479532 40 144383424404966638976 ```
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