T(n,k) = Number of (n+k-1) X (n+k-1) binary arrays with k 1s in every row and column with rows and columns in lexicographically nondecreasing order.

A227061

T(n,k) = Number of (n+k-1) X (n+k-1) binary arrays with k 1s in every row and column with rows and columns in lexicographically nondecreasing order.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =1a(8) =2a(9) =1a(10) =1a(11) =1a(12) =3a(13) =5a(14) =1a(15) =1a(16) =1a(17) =5a(18) =25a(19) =13a(20) =1a(21) =1a(22) =1a(23) =8a(24) =161a(25) =272a(26) =42a(27) =1a(28) =1a(29) =1

External references