Triangle T(n,k) read by rows: number of k X k triangular (0,1)-matrices with exactly n entries equal to 1 and no zero rows or columns.

A137252

Triangle T(n,k) read by rows: number of k X k triangular (0,1)-matrices with exactly n entries equal to 1 and no zero rows or columns.

Terms

    a(0) =1a(1) =0a(2) =1a(3) =0a(4) =0a(5) =1a(6) =0a(7) =0a(8) =1a(9) =1a(10) =0a(11) =0a(12) =0a(13) =4a(14) =1a(15) =0a(16) =0a(17) =0a(18) =4a(19) =11a(20) =1a(21) =0a(22) =0a(23) =0a(24) =1a(25) =33a(26) =26a(27) =1a(28) =0a(29) =0

External references