Numerator of Euler(n, 4/9).

Terms

a(0) =1a(1) =-1a(2) =-20a(3) =121a(4) =2020a(5) =-10201a(6) =-498860a(7) =14111177a(8) =229352740a(9) =-2085384391a(10) =-169413817100