Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1010-1111-0010 pattern in any orientation.
A146630
Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1010-1111-0010 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =3a(8) =9a(9) =19a(10) =33a(11) =61a(12) =181a(13) =701a(14) =2981a(15) =12267a(16) =47389a(17) =212787a(18) =1164819a(19) =7692083a(20) =54594417a(21) =416739483a(22) =3346928919
External references
- oeis: A146630