Triangle T(n,k) giving number of 3 X k polyominoes with n cells (n >= 3, 1<=k<=n-2).

Terms

a(0) =1a(1) =0a(2) =3a(3) =0a(4) =2a(5) =9a(6) =0a(7) =1a(8) =12a(9) =15a(10) =0a(11) =0a(12) =12a(13) =39a(14) =25a(15) =0a(16) =0a(17) =4a(18) =59a(19) =96a(20) =35a(21) =0a(22) =0a(23) =1a(24) =42a(25) =210a(26) =188a(27) =49a(28) =0a(29) =0