Number of (n+2) X (n+2) binary matrices with every 3 X 3 block having exactly four 1's.

A181254

Number of (n+2) X (n+2) binary matrices with every 3 X 3 block having exactly four 1's.

Terms

    a(0) =126a(1) =746a(2) =3190a(3) =10818a(4) =41374a(5) =133850a(6) =386406a(7) =1297322a(8) =3873790a(9) =10724850

External references