Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1000-1001-1111 pattern in any orientation.
A147135
Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1000-1001-1111 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) =9a(10) =19a(11) =33a(12) =59a(13) =157a(14) =473a(15) =1581a(16) =5917a(17) =23197a(18) =94123a(19) =435079a(20) =2125669
External references
- oeis: A147135