Duplicate of A093344.A093904Duplicate of A093344.Terms a(0) =0a(1) =1a(2) =4a(3) =17a(4) =84a(5) =485a(6) =3236a(7) =24609a(8) =210572a(9) =2004749a(10) =21033900a(11) =241237001External referencesoeis: A093904