Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 00100-11111-00100 pattern in any orientation.
A147009
Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 00100-11111-00100 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =3a(8) =6a(9) =13a(10) =20a(11) =35a(12) =74a(13) =191a(14) =479a(15) =1455a(16) =4033a(17) =12735a(18) =40335a(19) =153380a(20) =583871
External references
- oeis: A147009