Number of (n+2)X(5+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 or 00000011.

A259720

Number of (n+2)X(5+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 or 00000011.

Terms

    a(0) =312a(1) =556a(2) =1244a(3) =2218a(4) =3120a(5) =7076a(6) =13920a(7) =21398a(8) =42208a(9) =89194a(10) =149000a(11) =268204a(12) =564516a(13) =1024388a(14) =1778248a(15) =3578760a(16) =6862832a(17) =12025406a(18) =23011356a(19) =45100872a(20) =81318516a(21) =150518778a(22) =293879516a(23) =545191574a(24) =996711856a(25) =1914996584a(26) =3620486244

External references