Number of (n+2)X(7+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000011 or 00010011.

A260766

Number of (n+2)X(7+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000011 or 00010011.

Terms

    a(0) =2478a(1) =3196a(2) =8056a(3) =16095a(4) =21594a(5) =48788a(6) =104308a(7) =173103a(8) =341748a(9) =744619a(10) =1358260a(11) =2565577a(12) =5470804a(13) =10614658a(14) =19796560a(15) =40837698a(16) =81880380a(17) =154619606a(18) =308916626a(19) =626419385a(20) =1206215390a(21) =2364580587a(22) =4777393178a(23) =9359594548a(24) =18228148840

External references