Number of (n+2)X(3+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00010101 00101011 or 01010101.
A260922
Number of (n+2)X(3+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00010101 00101011 or 01010101.
Terms
- a(0) =104a(1) =146a(2) =401a(3) =896a(4) =1800a(5) =3358a(6) =7680a(7) =14924a(8) =32431a(9) =62992a(10) =139263a(11) =269060a(12) =591945a(13) =1148020a(14) =2528065a(15) =4893596a(16) =10776857a(17) =20877196a(18) =45968189a(19) =89026604a(20) =196045769a(21) =379710316a(22) =836112021a(23) =1619399516a(24) =3565959873a(25) =6906609340a(26) =15208409269
External references
- oeis: A260922