Number of n X 2 0..1 arrays with each 1 adjacent to 1, 3 or 4 king-move neighboring 1s.

A296798

Number of n X 2 0..1 arrays with each 1 adjacent to 1, 3 or 4 king-move neighboring 1s.

Terms

    a(0) =2a(1) =8a(2) =15a(3) =41a(4) =122a(5) =308a(6) =855a(7) =2405a(8) =6522a(9) =18080a(10) =50223a(11) =138353a(12) =383114a(13) =1061116a(14) =2933431a(15) =8119437a(16) =22473514a(17) =62177224a(18) =172075759a(19) =476212281a(20) =1317772378a(21) =3646788996a(22) =10092010711a(23) =27927735285a(24) =77286019354a(25) =213877500592

External references