Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1000-1110-0111-0001 pattern in any orientation.
A147399
Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1000-1110-0111-0001 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =1a(8) =5a(9) =5a(10) =17a(11) =17a(12) =45a(13) =45a(14) =217a(15) =217a(16) =1729a(17) =1729a(18) =28581a(19) =28581a(20) =422837a(21) =422837a(22) =7769557a(23) =7769557a(24) =212491441a(25) =212491441
External references
- oeis: A147399