Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 0111-1100-0111 pattern in any orientation.
A147372
Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 0111-1100-0111 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =1a(8) =4a(9) =7a(10) =14a(11) =21a(12) =40a(13) =79a(14) =252a(15) =611a(16) =2359a(17) =6199a(18) =23158a(19) =70484a(20) =325136a(21) =1222235a(22) =6869095a(23) =29506240a(24) =189032773a(25) =936666179
External references
- oeis: A147372