Number of (n+2)X(4+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 or 00000011.

A259719

Number of (n+2)X(4+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 or 00000011.

Terms

    a(0) =242a(1) =392a(2) =1064a(3) =2059a(4) =2218a(5) =5458a(6) =12198a(7) =16269a(8) =30246a(9) =71722a(10) =114938a(11) =186119a(12) =418594a(13) =768832a(14) =1221808a(15) =2484405a(16) =4916514a(17) =8160850a(18) =15213700a(19) =30646619a(20) =53913804a(21) =95998916a(22) =189578558a(23) =349488589a(24) =616691978a(25) =1178428556a(26) =2229228408

External references