Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 11110-01111 pattern in any orientation.
A147509
Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 11110-01111 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =3a(8) =5a(9) =9a(10) =15a(11) =23a(12) =53a(13) =159a(14) =467a(15) =1455a(16) =4183a(17) =13257a(18) =47381a(19) =210539a(20) =963601a(21) =4871497a(22) =24721415a(23) =137844971a(24) =829467103a(25) =5811222331
External references
- oeis: A147509