Number of n X n 0..1 arrays with every element equal to 0, 1, 2, 5 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.
A303176
Number of n X n 0..1 arrays with every element equal to 0, 1, 2, 5 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.
Terms
- a(0) =1a(1) =8a(2) =31a(3) =297a(4) =5613a(5) =218980a(6) =11901719a(7) =1341217380a(8) =375045359077
External references
- oeis: A303176