Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1000-1000-1000-1111 pattern in any orientation.
A147095
Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1000-1000-1000-1111 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =3a(5) =3a(6) =5a(7) =7a(8) =23a(9) =43a(10) =97a(11) =209a(12) =521a(13) =1391a(14) =4635a(15) =14277a(16) =54221a(17) =189323a(18) =860301a(19) =3540691a(20) =18022413a(21) =86154579a(22) =507402119a(23) =2814410215a(24) =19349048791a(25) =125262392501
External references
- oeis: A147095