Number of 2Xn 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 0, 2 or 4 neighboring 1s.

A297695

Number of 2Xn 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 0, 2 or 4 neighboring 1s.

Terms

    a(0) =4a(1) =8a(2) =26a(3) =60a(4) =176a(5) =436a(6) =1216a(7) =3120a(8) =8488a(9) =22160a(10) =59552a(11) =156816a(12) =418880a(13) =1107712a(14) =2950048a(15) =7817664a(16) =20789248a(17) =55148864a(18) =146548736a(19) =388957440a(20) =1033216640a(21) =2742970624a(22) =7285063168a(23) =19342708992a(24) =51367846912a(25) =136396150784a(26) =362207435264

External references