Numerator of Euler(n, 1/6).

Terms

a(0) =1a(1) =-1a(2) =-5a(3) =23a(4) =205a(5) =-1681a(6) =-22265a(7) =257543a(8) =4544185a(9) =-67637281a(10) =-1491632525a(11) =27138236663a(12) =718181418565