Number of nX3 0..1 arrays with every element equal to 0, 2, 3, 4 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

A303079

Number of nX3 0..1 arrays with every element equal to 0, 2, 3, 4 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

Terms

    a(0) =1a(1) =12a(2) =32a(3) =112a(4) =416a(5) =1512a(6) =5472a(7) =19904a(8) =72396a(9) =263136a(10) =956480a(11) =3477232a(12) =12641136a(13) =45954928a(14) =167063792a(15) =607344064a(16) =2207938656a(17) =8026742304a(18) =29180448720a(19) =106082737616a(20) =385653691936

External references