Number of (n+2) X (3+2) 0..1 arrays with each 3 X 3 subblock having clockwise perimeter pattern 00000000 00000001 or 00001001.
A259957
Number of (n+2) X (3+2) 0..1 arrays with each 3 X 3 subblock having clockwise perimeter pattern 00000000 00000001 or 00001001.
Terms
- a(0) =155a(1) =439a(2) =1603a(3) =5449a(4) =18681a(5) =64891a(6) =222813a(7) =764865a(8) =2637815a(9) =9090487a(10) =31281933a(11) =107674395a(12) =370788133a(13) =1276814309a(14) =4396089911a(15) =15135449051a(16) =52112945503a(17) =179433951141a(18) =617811988681
External references
- oeis: A259957