Number of polyiamonds with n cells without holes that do not tile the plane.

Terms

a(0) =0a(1) =0a(2) =0a(3) =0a(4) =0a(5) =0a(6) =1a(7) =0a(8) =20a(9) =103a(10) =594a(11) =1192a(12) =6290a(13) =18099a(14) =54808a(15) =159048a(16) =502366a(17) =1374593a(18) =4076218a(19) =11378831a(20) =32674779a(21) =93006494a(22) =264720498a(23) =748062099a(24) =2134512296a(25) =6071524897a(26) =17289205132a(27) =49268564671a(28) =140605019208a(29) =401392287316