Number of (n+2)X(4+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000011 or 00001111.

A260366

Number of (n+2)X(4+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000011 or 00001111.

Terms

    a(0) =436a(1) =700a(2) =2014a(3) =4633a(4) =5326a(5) =12858a(6) =32488a(7) =46993a(8) =89140a(9) =223963a(10) =379838a(11) =657619a(12) =1551102a(13) =2943373a(14) =5005180a(15) =10882474a(16) =22057020a(17) =38567570a(18) =77971796a(19) =162031604a(20) =295335654a(21) =570612861a(22) =1181007446a(23) =2235793266a(24) =4234428804a(25) =8612184438

External references