Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 01110-11111 pattern in any orientation.
A147364
Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 01110-11111 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =2a(7) =3a(8) =6a(9) =9a(10) =16a(11) =23a(12) =72a(13) =173a(14) =621a(15) =1620a(16) =5393a(17) =14347a(18) =63207a(19) =232978a(20) =1333190a(21) =5780677a(22) =34593611a(23) =163090674a(24) =1165840626a(25) =6871746297
External references
- oeis: A147364