Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 01000-11111-00010 pattern in any orientation.
A147017
Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 01000-11111-00010 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =3a(8) =15a(9) =21a(10) =45a(11) =77a(12) =277a(13) =567a(14) =2577a(15) =6557a(16) =31507a(17) =89591a(18) =535509a(19) =1822317a(20) =13376361a(21) =54721945a(22) =461666973a(23) =2203494951a(24) =22033823051
External references
- oeis: A147017