Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1001-1111-0100 pattern in any orientation.
A146833
Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1001-1111-0100 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) =317a(13) =317a(14) =3643a(15) =3643a(16) =63437a(17) =63437a(18) =1864637a(19) =1864637a(20) =68228177a(21) =68228177
External references
- oeis: A146833