Number of (n+2)X(5+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000101 or 00010101.

A260103

Number of (n+2)X(5+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000101 or 00010101.

Terms

    a(0) =1116a(1) =2794a(2) =6878a(3) =18209a(4) =47576a(5) =127549a(6) =336302a(7) =903901a(8) =2402228a(9) =6409084a(10) =17062892a(11) =45475225a(12) =121085556a(13) =322576455a(14) =859264712a(15) =2288630270a(16) =6095305826a(17) =16236483672a(18) =43246325168a(19) =115187673101a(20) =306802389494a(21) =817180484269

External references