Number of (n+2)X(5+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00010101 or 01010101.

A261289

Number of (n+2)X(5+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00010101 or 01010101.

Terms

    a(0) =307a(1) =409a(2) =1086a(3) =2586a(4) =6996a(5) =17094a(6) =48435a(7) =115722a(8) =323733a(9) =784568a(10) =2200256a(11) =5297320a(12) =14860295a(13) =35870866a(14) =100565666a(15) =242543592a(16) =680254258a(17) =1640988402a(18) =4601509246a(19) =11100042154a(20) =31128297887a(21) =75088246466a(22) =210566880369a(23) =507941745824

External references