Number of (n+2)X(3+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000011 or 00001001.

A260289

Number of (n+2)X(3+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000011 or 00001001.

Terms

    a(0) =274a(1) =544a(2) =1336a(3) =2966a(4) =3764a(5) =8660a(6) =21028a(7) =33108a(8) =60116a(9) =153106a(10) =281552a(11) =470266a(12) =1099824a(13) =2313010a(14) =3881332a(15) =8077044a(16) =18072880a(17) =32543750a(18) =61542056a(19) =137276390a(20) =267566512a(21) =487537360a(22) =1035708408a(23) =2138977088a(24) =3943056064a(25) =7908672984

External references