Number of n X 3 0..1 arrays with every element equal to 1, 2 or 3 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.
A302219
Number of n X 3 0..1 arrays with every element equal to 1, 2 or 3 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.
Terms
- a(0) =1a(1) =14a(2) =43a(3) =194a(4) =675a(5) =2666a(6) =9819a(7) =37382a(8) =140039a(9) =528962a(10) =1989787a(11) =7501790a(12) =28252719a(13) =106464314a(14) =401084083a(15) =1511229542a(16) =5693728487a(17) =21452605794a(18) =80826937611a(19) =304534567726
External references
- oeis: A302219