Number of (n+2)X(3+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000000 00000001 or 00001011.
A260279
Number of (n+2)X(3+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000000 00000001 or 00001011.
Terms
- a(0) =99a(1) =230a(2) =747a(3) =2027a(4) =5420a(5) =15306a(6) =42175a(7) =114513a(8) =316679a(9) =874845a(10) =2397776a(11) =6596755a(12) =18184634a(13) =50001731a(14) =137513534a(15) =378580791a(16) =1041706050a(17) =2865675286a(18) =7885936120a(19) =21700245925a(20) =59706090387a(21) =164287119004a(22) =452064660346
External references
- oeis: A260279