Number of n X 3 0..1 arrays with every element equal to 1, 2 or 4 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

A302273

Number of n X 3 0..1 arrays with every element equal to 1, 2 or 4 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

Terms

    a(0) =1a(1) =7a(2) =22a(3) =79a(4) =269a(5) =942a(6) =3401a(7) =12283a(8) =43006a(9) =156939a(10) =565249a(11) =2007662a(12) =7307653a(13) =26305407a(14) =94096702a(15) =341521831a(16) =1229036517a(17) =4413205998a(18) =15980067713a(19) =57514505187a(20) =206942767678a(21) =748087603299

External references