Number of nX4 0..1 arrays with every element equal to 0, 1, 3, 4 or 5 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.
A302873
Number of nX4 0..1 arrays with every element equal to 0, 1, 3, 4 or 5 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.
Terms
- a(0) =5a(1) =21a(2) =35a(3) =95a(4) =285a(5) =858a(6) =2938a(7) =11126a(8) =44216a(9) =186565a(10) =819633a(11) =3681703a(12) =16781413a(13) =77160382a(14) =356502109a(15) =1651886591a(16) =7666887125a(17) =35617442101a(18) =165553926866a(19) =769750431744
External references
- oeis: A302873