Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1000-1111-0001 pattern in any orientation.
A146606
Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1000-1111-0001 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =1a(8) =3a(9) =7a(10) =13a(11) =23a(12) =55a(13) =135a(14) =381a(15) =1155a(16) =4259a(17) =15095a(18) =63361a(19) =271287a(20) =1364019a(21) =7046127a(22) =42849769a(23) =267209541a(24) =1961120087a(25) =14636956303a(26) =129172123843
External references
- oeis: A146606