Number of (n+2)X(7+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000101 or 00010101.

A260105

Number of (n+2)X(7+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000101 or 00010101.

Terms

    a(0) =6068a(1) =16453a(2) =42372a(3) =121800a(4) =336302a(5) =965197a(6) =2703084a(7) =7792018a(8) =22113228a(9) =63167136a(10) =179982226a(11) =513478377a(12) =1462536224a(13) =4168738950a(14) =11886385630a(15) =33880353109a(16) =96579218388a(17) =275361558899a(18) =784995134662

External references