Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1000-1100-0111-0010 pattern in any orientation.
A147151
Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1000-1100-0111-0010 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =1a(8) =5a(9) =13a(10) =25a(11) =61a(12) =195a(13) =561a(14) =1503a(15) =6349a(16) =34075a(17) =171101a(18) =895779a(19) =5615365a(20) =39425317a(21) =281937999
External references
- oeis: A147151