Number of (n+2)X(2+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000011 or 00001011.

A260495

Number of (n+2)X(2+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000011 or 00001011.

Terms

    a(0) =83a(1) =136a(2) =347a(3) =683a(4) =942a(5) =2115a(6) =4393a(7) =6800a(8) =13290a(9) =27885a(10) =47140a(11) =86478a(12) =177017a(13) =317762a(14) =571813a(15) =1132672a(16) =2104849a(17) =3796781a(18) =7316331a(19) =13812624a(20) =25170727a(21) =47622068a(22) =90289367a(23) =166305539a(24) =311514903a(25) =589735035a(26) =1095258406a(27) =2043057469a(28) =3854473062

External references