Number of rooted 2-dimensional polyominoes with n triangular cells, with no symmetries removed.

A094164

Number of rooted 2-dimensional polyominoes with n triangular cells, with no symmetries removed.

Terms

    a(0) =1a(1) =3a(2) =9a(3) =28a(4) =90a(5) =282a(6) =875a(7) =2700a(8) =8271a(9) =25265a(10) =77088a(11) =235014a(12) =716261a(13) =2182257a(14) =6646200a(15) =20234080a(16) =61581327a(17) =187366482a(18) =569947883a(19) =1733389620a(20) =5270937735a(21) =16025807017a(22) =48719131461a(23) =148092422604a(24) =450116618125

External references