Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 01000-11111-01000 pattern in any orientation.
A147025
Number of n X n binary arrays symmetric under 90 degree rotation 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) =3a(8) =15a(9) =21a(10) =45a(11) =77a(12) =273a(13) =569a(14) =2606a(15) =6661a(16) =31883a(17) =89951a(18) =535540a(19) =1839325a(20) =13532589a(21) =55467031a(22) =467306429a(23) =2229430591a(24) =22257836225
External references
- oeis: A147025