Number of (n+2)X(6+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000101 or 00001001.

A260246

Number of (n+2)X(6+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000101 or 00001001.

Terms

    a(0) =4027a(1) =7822a(2) =22944a(3) =42143a(4) =122048a(5) =416911a(6) =906498a(7) =2164027a(8) =6912900a(9) =19008695a(10) =42243368a(11) =118693767a(12) =351663576a(13) =862455845a(14) =2149354562a(15) =6271021751a(16) =16817997488a(17) =41248933871a(18) =112144132366a(19) =314044473839a(20) =801369177620

External references