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

A135589

Triangle T(n,k) read by rows: number of k X k symmetric (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) =2a(6) =0a(7) =0a(8) =2a(9) =4a(10) =0a(11) =0a(12) =1a(13) =9a(14) =10a(15) =0a(16) =0a(17) =0a(18) =12a(19) =36a(20) =26a(21) =0a(22) =0a(23) =0a(24) =10a(25) =76a(26) =140a(27) =76a(28) =0a(29) =0

External references