Number of symmetric binary n X n matrices with no 2 X 2 submatrix of all 1s.

A352258

Number of symmetric binary n X n matrices with no 2 X 2 submatrix of all 1s.

Terms

    a(0) =2a(1) =7a(2) =42a(3) =399a(4) =5614a(5) =112221a(6) =3102020a(7) =116076057a(8) =5774524092a(9) =376068483351

External references