Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 0100-0100-1111 pattern in any orientation.
A146574
Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 0100-0100-1111 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =3a(7) =5a(8) =11a(9) =21a(10) =43a(11) =131a(12) =425a(13) =1453a(14) =5677a(15) =20565a(16) =100203a(17) =517949a(18) =3251987a(19) =21002085a(20) =153166855a(21) =1157817079a(22) =10741996431a(23) =104706915655
External references
- oeis: A146574