Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1101-0111-0100 pattern in any orientation.
A146857
Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1101-0111-0100 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =1a(8) =17a(9) =17a(10) =49a(11) =49a(12) =249a(13) =249a(14) =3481a(15) =3481a(16) =80333a(17) =80333a(18) =1943801a(19) =1943801a(20) =59816323a(21) =59816323
External references
- oeis: A146857