Number of (n+2)X(n+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000011 or 00010011.
A260759
Number of (n+2)X(n+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000011 or 00010011.
Terms
- a(0) =48a(1) =115a(2) =652a(3) =2449a(4) =5256a(5) =24103a(6) =104308a(7) =305402a(8) =1256376a(9) =5925416a(10) =21507088a(11) =91126064a(12) =441481332a(13) =1976848566a(14) =8589712868a(15) =45244127036a(16) =228262628800
External references
- oeis: A260759