Unbranched a-4-catapolynonagons (see Brunvoll reference for precise definition).

A121126

Unbranched a-4-catapolynonagons (see Brunvoll reference for precise definition).

Terms

    a(0) =1a(1) =4a(2) =40a(3) =330a(4) =2814a(5) =22464a(6) =174798a(7) =1321920a(8) =9798840a(9) =71383680a(10) =512709912a(11) =3638048256a(12) =25547006016a(13) =177770557440

External references