Number of free poly-[4.6.12]-tiles (holes allowed) with n cells (division into triangles is significant).

A197462

Number of free poly-[4.6.12]-tiles (holes allowed) with n cells (division into triangles is significant).

Terms

    a(0) =1a(1) =3a(2) =3a(3) =9a(4) =14a(5) =38a(6) =74a(7) =185a(8) =414a(9) =1026a(10) =2440a(11) =6077a(12) =14926a(13) =37454a(14) =93749a(15) =237035a(16) =599815a(17) =1526020a(18) =3889117a(19) =9944523a(20) =25475398a(21) =65416733a(22) =168277945a(23) =433705325a(24) =1119610147a(25) =2894928713

External references