Number of nX2 0..1 arrays with every element unequal to 1, 2, 3, 4 or 5 king-move adjacent elements, with upper left element zero.

A304421

Number of nX2 0..1 arrays with every element unequal to 1, 2, 3, 4 or 5 king-move adjacent elements, with upper left element zero.

Terms

    a(0) =1a(1) =7a(2) =25a(3) =98a(4) =383a(5) =1493a(6) =5824a(7) =22717a(8) =88609a(9) =345626a(10) =1348139a(11) =5258513a(12) =20511208a(13) =80005441a(14) =312066973a(15) =1217239658a(16) =4747930775a(17) =18519645245a(18) =72237207376a(19) =281766419413

External references