Number of (n+2)X(n+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000011 or 00010101.

A260833

Number of (n+2)X(n+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000011 or 00010101.

Terms

    a(0) =48a(1) =131a(2) =700a(3) =2235a(4) =3828a(5) =19718a(6) =80516a(7) =181176a(8) =766388a(9) =3885356a(10) =12122540a(11) =43330160a(12) =229463444a(13) =972300920a(14) =3559612500a(15) =17890822312a(16) =91527500980

External references