Number of n X 3 binary arrays with some element plus some horizontally, vertically, diagonally or antidiagonally adjacent neighbor totalling two no more than once.

A268776

Number of n X 3 binary arrays with some element plus some horizontally, vertically, diagonally or antidiagonally adjacent neighbor totalling two no more than once.

Terms

    a(0) =7a(1) =26a(2) =91a(3) =316a(4) =1031a(5) =3354a(6) =10615a(7) =33344a(8) =103339a(9) =317958a(10) =970515a(11) =2945172a(12) =8888719a(13) =26705714a(14) =79909167a(15) =238257768a(16) =708129267a(17) =2098664158a(18) =6203795403a(19) =18296271036a(20) =53845375703a(21) =158159174410a(22) =463734769895

External references