Numerator of Euler(n, 2/5).

Terms

a(0) =1a(1) =-1a(2) =-6a(3) =37a(4) =186a(5) =-961a(6) =-14166a(7) =410189a(8) =2009946a(9) =-18708871a(10) =-458225526a(11) =10426234927a(12) =153212718906