Number of nX4 0..1 arrays with every element equal to 2, 3, 4 or 5 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
A300642
Number of nX4 0..1 arrays with every element equal to 2, 3, 4 or 5 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
Terms
- a(0) =0a(1) =4a(2) =10a(3) =64a(4) =316a(5) =1789a(6) =9738a(7) =54293a(8) =300456a(9) =1669005a(10) =9263141a(11) =51430163a(12) =285537725a(13) =1585321263a(14) =8801860535a(15) =48868792430a(16) =271324801628
External references
- oeis: A300642