Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 0100-1111-0100 pattern in any orientation.
A146377
Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 0100-1111-0100 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =3a(8) =7a(9) =13a(10) =21a(11) =39a(12) =136a(13) =493a(14) =1722a(15) =5497a(16) =18675a(17) =87521a(18) =494306a(19) =2893703a(20) =17090719a(21) =106149289a(22) =783678982a(23) =6830573137a(24) =66084580709a(25) =674363788779
External references
- oeis: A146377