Number of (n+2)X(4+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00001011 00010101 or 01010101.

A261376

Number of (n+2)X(4+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00001011 00010101 or 01010101.

Terms

    a(0) =97a(1) =157a(2) =424a(3) =1040a(4) =2282a(5) =5254a(6) =12500a(7) =28885a(8) =66332a(9) =154413a(10) =358786a(11) =830309a(12) =1923846a(13) =4465820a(14) =10349526a(15) =23993883a(16) =55620850a(17) =129004265a(18) =298983410a(19) =693371845a(20) =1607151330a(21) =3727183505a(22) =8638778942a(23) =20034575762a(24) =46436324264

External references