Number of (n+2)X(4+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000000 00000001 or 00001011.

A260280

Number of (n+2)X(4+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000000 00000001 or 00001011.

Terms

    a(0) =202a(1) =525a(2) =2027a(3) =6044a(4) =18380a(5) =60955a(6) =192277a(7) =595506a(8) =1903722a(9) =6052530a(10) =19003962a(11) =60149738a(12) =190824807a(13) =602506945a(14) =1904270753a(15) =6029330442a(16) =19066139003a(17) =60275105360a(18) =190686505791a(19) =603143941550

External references