Numerator of Euler(n,2).

Terms

a(0) =1a(1) =3a(2) =2a(3) =9a(4) =2a(5) =3a(6) =2a(7) =33a(8) =2a(9) =-27a(10) =2a(11) =699a(12) =2a(13) =-5457a(14) =2a(15) =929601a(16) =2a(17) =-3202287a(18) =2a(19) =221930589a(20) =2a(21) =-4722116517a(22) =2a(23) =968383680843a(24) =2a(26) =2a(28) =2a(30) =2a(32) =2a(34) =2