Number of n X n binary matrices, symmetric under horizontal and vertical reflection, with no more than 3 ones in any 2 X 2 subblock.

A141510

Number of n X n binary matrices, symmetric under horizontal and vertical reflection, with no more than 3 ones in any 2 X 2 subblock.

Terms

    a(0) =1a(1) =2a(2) =1a(3) =15a(4) =8a(5) =417a(6) =135a(7) =42176a(8) =10425a(9) =15701273a(10) =2699264a(11) =21418970801a(12) =2653515137

External references