Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 01000-11111-01000 pattern in any orientation.
A147021
Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 01000-11111-01000 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =1a(8) =1a(9) =1a(10) =33a(11) =13a(12) =357a(13) =57a(14) =3654a(15) =277a(16) =39873a(17) =2427a(18) =687008a(19) =27961a(20) =15511627a(21) =440433a(22) =608333563a(23) =11044775a(24) =33683651469a(25) =365499077
External references
- oeis: A147021