Number of (n+2)X(6+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 or 00000011.

A259721

Number of (n+2)X(6+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 or 00000011.

Terms

    a(0) =722a(1) =1219a(2) =2858a(3) =5458a(4) =7076a(5) =16294a(6) =33846a(7) =51254a(8) =99106a(9) =219106a(10) =370024a(11) =652886a(12) =1414066a(13) =2633049a(14) =4520036a(15) =9213528a(16) =18221034a(17) =32003265a(18) =61343826a(19) =123580357a(20) =226046956a(21) =418183961a(22) =832221248a(23) =1576875191a(24) =2893948292a(25) =5623390081

External references