Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1110-0100-0111 pattern in any orientation.
A146873
Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1110-0100-0111 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =1a(8) =17a(9) =17a(10) =49a(11) =49a(12) =129a(13) =129a(14) =2097a(15) =2097a(16) =70513a(17) =70513a(18) =1502401a(19) =1502401a(20) =23706401a(21) =23706401
External references
- oeis: A146873