Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 11100-00100-00111 pattern in any orientation.
A147251
Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 11100-00100-00111 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) =5a(10) =11a(11) =17a(12) =47a(13) =101a(14) =251a(15) =493a(16) =1875a(17) =5405a(18) =23441a(19) =71481a(20) =351927a(21) =1342835a(22) =7434603a(23) =30903299a(24) =201078705a(25) =1028625049
External references
- oeis: A147251