Triangle T(n,k) read by rows: the number of traceless symmetric binary n X n matrices with 2k one's and no all-1 2 X 2 submatrix.

A352472

Triangle T(n,k) read by rows: the number of traceless symmetric binary n X n matrices with 2k one's and no all-1 2 X 2 submatrix.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =3a(5) =3a(6) =1a(7) =1a(8) =6a(9) =15a(10) =20a(11) =12a(12) =1a(13) =10a(14) =45a(15) =120a(16) =195a(17) =162a(18) =15a(19) =1a(20) =15a(21) =105a(22) =455a(23) =1320a(24) =2508a(25) =2680a(26) =900a(27) =1a(28) =21a(29) =210

External references