Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 110-111-100 pattern in any orientation.
A146184
Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 110-111-100 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =3a(7) =9a(8) =19a(9) =33a(10) =87a(11) =301a(12) =1337a(13) =5927a(14) =24359a(15) =118543a(16) =715115a(17) =5164241a(18) =42357883a(19) =353625469a(20) =3347092839a(21) =36905312969a(22) =482588953149
External references
- oeis: A146184