Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 0100-1111-0010 pattern in any orientation.
A146367
Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 0100-1111-0010 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =1a(8) =9a(9) =9a(10) =25a(11) =25a(12) =125a(13) =125a(14) =1323a(15) =1323a(16) =18755a(17) =18755a(18) =388143a(19) =388143a(20) =11998517a(21) =11998517a(22) =573092271a(23) =573092271a(24) =41661958269a(25) =41661958269
External references
- oeis: A146367