Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1100-0110-0011 pattern in any orientation.
A146449
Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1100-0110-0011 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =3a(8) =7a(9) =13a(10) =37a(11) =103a(12) =247a(13) =705a(14) =2637a(15) =10751a(16) =47763a(17) =249479a(18) =1432497a(19) =8448903a(20) =55396711a(21) =408864319a(22) =3345198367a(23) =30485497915a(24) =317358146063
External references
- oeis: A146449