Triangle T(n,k) giving number of 4 X k polyominoes with n cells (n >= 4, 1<=k<=n-3).

Terms

a(0) =1a(1) =0a(2) =3a(3) =0a(4) =6a(5) =15a(6) =0a(7) =2a(8) =39a(9) =30a(10) =0a(11) =1a(12) =59a(13) =148a(14) =61a(15) =0a(16) =0a(17) =42a(18) =349a(19) =383a(20) =97a(21) =0a(22) =0a(23) =21a(24) =519a(25) =1304a(26) =822a(27) =155a(28) =0a(29) =0