Triangle T(n,k) by rows: number of ways k dominoes can be placed on an n X n chessboard, k>=0.

Terms

a(0) =1a(1) =1a(2) =1a(3) =4a(4) =2a(5) =1a(6) =12a(7) =44a(8) =56a(9) =18a(10) =1a(11) =24a(12) =224a(13) =1044a(14) =2593a(15) =3388a(16) =2150a(17) =552a(18) =36a(19) =1a(20) =40a(21) =686a(22) =6632a(23) =39979a(24) =157000a(25) =407620a(26) =695848a(27) =762180a(28) =510752a(29) =192672