Triangle T(n,k) read by rows: the number of symmetric binary n X n matrices with k ones and no all-1 2 X 2 submatrix.

A350189

Triangle T(n,k) read by rows: the number of symmetric binary n X n matrices with k ones and no all-1 2 X 2 submatrix.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =2a(5) =2a(6) =2a(7) =1a(8) =3a(9) =6a(10) =10a(11) =9a(12) =9a(13) =4a(14) =1a(15) =4a(16) =12a(17) =28a(18) =46a(19) =72a(20) =80a(21) =80a(22) =60a(23) =16a(24) =1a(25) =5a(26) =20a(27) =60a(28) =140a(29) =296

External references