Number of (n+2) X (2+2) 0..1 arrays with each 3 X 3 subblock having clockwise perimeter pattern 00000001 00000011 or 00000111.

A260064

Number of (n+2) X (2+2) 0..1 arrays with each 3 X 3 subblock having clockwise perimeter pattern 00000001 00000011 or 00000111.

Terms

    a(0) =91a(1) =214a(2) =594a(3) =1214a(4) =2367a(5) =5776a(6) =13366a(7) =28064a(8) =63014a(9) =147105a(10) =325915a(11) =721179a(12) =1649899a(13) =3734463a(14) =8328506a(15) =18806873a(16) =42666206a(17) =95949037a(18) =215937944a(19) =488468336a(20) =1102502639a(21) =2483197081a(22) =5605117964a(23) =12658186788a(24) =28545528326a(25) =64390447013

External references