Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 3X2 zee 1,1 1,2 1,3 2,3 2,4 in any orientation.
A146133
Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 3X2 zee 1,1 1,2 1,3 2,3 2,4 in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =3a(6) =17a(7) =33a(8) =85a(9) =255a(10) =1137a(11) =4265a(12) =27311a(13) =122911a(14) =972783a(15) =6003645a(16) =62308027a(17) =499428829a(18) =6712583897a(19) =70003989585
External references
- oeis: A146133