Number of nX7 0..1 arrays with no element equal to more than two of its horizontal, vertical and antidiagonal neighbors, with the exception of exactly two elements, and with new values introduced in order 0 sequentially upwards.
A280809
Number of nX7 0..1 arrays with no element equal to more than two of its horizontal, vertical and antidiagonal neighbors, with the exception of exactly two elements, and with new values introduced in order 0 sequentially upwards.
Terms
- a(0) =0a(1) =1047a(2) =24490a(3) =133067a(4) =521862a(5) =1736603a(6) =5219491a(7) =14672850a(8) =39446188a(9) =102668319a(10) =261032587a(11) =651872767a(12) =1605291205a(13) =3909190755a(14) =9432062891a(15) =22579858190a(16) =53688882185a(17) =126896063565a(18) =298328702932a(19) =698005209403
External references
- oeis: A280809