Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1010-1111-0100 pattern in any orientation.
A146638
Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1010-1111-0100 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) =57a(12) =181a(13) =727a(14) =3143a(15) =12709a(16) =46177a(17) =203713a(18) =1168453a(19) =7869343a(20) =57494841a(21) =429662591a(22) =3357500475
External references
- oeis: A146638