Number of subdiagonal directed diagonally-convex animals with given diagonal semiperimeter.

A053022

Number of subdiagonal directed diagonally-convex animals with given diagonal semiperimeter.

Terms

    a(0) =1a(1) =1a(2) =3a(3) =9a(4) =30a(5) =107a(6) =396a(7) =1506a(8) =5848a(9) =23087a(10) =92381a(11) =373830a(12) =1527192a(13) =6290054a(14) =26090780a(15) =108895558a(16) =456992576a(17) =1927176941a(18) =8162557837a(19) =34708427777a(20) =148110582311a(21) =634074235584

External references