Number of nX4 0..1 arrays with every element equal to 1, 2 or 3 horizontally or antidiagonally adjacent elements, with upper left element zero.
A301947
Number of nX4 0..1 arrays with every element equal to 1, 2 or 3 horizontally or antidiagonally adjacent elements, with upper left element zero.
Terms
- a(0) =2a(1) =16a(2) =123a(3) =947a(4) =7326a(5) =56710a(6) =439078a(7) =3399722a(8) =26323903a(9) =203825456a(10) =1578217598a(11) =12220118582a(12) =94620225492a(13) =732643232114
External references
- oeis: A301947