Numerator of Sum_{k=0..n} (-1)^k/(2*k+1).

Terms

a(0) =1a(1) =2a(2) =13a(3) =76a(4) =263a(5) =2578a(6) =36979a(7) =33976a(8) =622637a(9) =11064338a(10) =11757173a(11) =255865444a(12) =1346255081a(13) =3852854518a(14) =116752370597