Numerator of Euler(n,1/3).

Terms

a(0) =1a(1) =-1a(2) =-2a(3) =13a(4) =22a(5) =-121a(6) =-602a(7) =18581a(8) =30742a(9) =-305071a(10) =-2523002a(11) =61203943a(12) =303692662a(13) =-4353296221a(14) =-50402079002