Number of nX2 0..1 arrays with every element unequal to 0, 1, 2 or 4 king-move adjacent elements, with upper left element zero.

A303794

Number of nX2 0..1 arrays with every element unequal to 0, 1, 2 or 4 king-move adjacent elements, with upper left element zero.

Terms

    a(0) =2a(1) =4a(2) =12a(3) =24a(4) =64a(5) =184a(6) =432a(7) =1088a(8) =2944a(9) =7360a(10) =18496a(11) =48384a(12) =123392a(13) =312320a(14) =804864a(15) =2061824a(16) =5248000a(17) =13449216a(18) =34455552a(19) =87961600a(20) =225038336a(21) =576143360a(22) =1472741376a(23) =3766452224a(24) =9638051840a(25) =24648581120a(26) =63037702144a(27) =161266270208

External references