Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 10000-11100-00111-00001 pattern in any orientation.
A147382
Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 10000-11100-00111-00001 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =1a(8) =3a(9) =11a(10) =25a(11) =47a(12) =101a(13) =257a(14) =681a(15) =1819a(16) =5437a(17) =17747a(18) =62109a(19) =244571a(20) =1025085a(21) =4586657a(22) =22318221
External references
- oeis: A147382