Number of (n+2)X(3+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00001001 or 00100101.

A260975

Number of (n+2)X(3+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00001001 or 00100101.

Terms

    a(0) =204a(1) =239a(2) =372a(3) =732a(4) =1288a(5) =2576a(6) =4688a(7) =8760a(8) =15964a(9) =30062a(10) =55496a(11) =105078a(12) =192148a(13) =361876a(14) =663360a(15) =1248880a(16) =2301984a(17) =4312846a(18) =7974836a(19) =14889918a(20) =27581092a(21) =51446550a(22) =95444100a(23) =177936588a(24) =330029564a(25) =614889132a(26) =1141497232a(27) =2126263226

External references