Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1000-1111-0101 pattern in any orientation.
A147182
Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1000-1111-0101 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) =45a(12) =119a(13) =351a(14) =1205a(15) =4331a(16) =19073a(17) =79485a(18) =399897a(19) =2087281a(20) =12888453a(21) =83190775
External references
- oeis: A147182