Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 10000-11111-00001 pattern in any orientation.
A147071
Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 10000-11111-00001 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =1a(8) =1a(9) =3a(10) =5a(11) =11a(12) =17a(13) =33a(14) =69a(15) =195a(16) =461a(17) =1581a(18) =4385a(19) =16401a(20) =52739a(21) =234041a(22) =877033a(23) =4605425a(24) =20357297a(25) =124937647
External references
- oeis: A147071