Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 00100-00100-11111-00100 pattern in any orientation.
A147330
Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 00100-00100-11111-00100 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =1a(8) =6a(9) =13a(10) =32a(11) =43a(12) =80a(13) =143a(14) =550a(15) =1371a(16) =5869a(17) =15663a(18) =62826a(19) =179478a(20) =939656a(21) =3406007a(22) =21134246a(23) =88331414a(24) =597297267
External references
- oeis: A147330