Number of nX3 0..1 arrays with every element equal to 0, 1 or 3 horizontally or antidiagonally adjacent elements, with upper left element zero.

A301879

Number of nX3 0..1 arrays with every element equal to 0, 1 or 3 horizontally or antidiagonally adjacent elements, with upper left element zero.

Terms

    a(0) =3a(1) =10a(2) =29a(3) =95a(4) =289a(5) =917a(6) =2841a(7) =8921a(8) =27801a(9) =87009a(10) =271657a(11) =849313a(12) =2653273a(13) =8292465a(14) =25910729a(15) =80972065a(16) =253021369a(17) =790675217a(18) =2470747561a(19) =7720841601a(20) =24126677401a(21) =75393222129a(22) =235594969737a(23) =736207657313

External references