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

Terms

a(0) =1a(1) =1a(2) =5a(3) =11a(4) =2a(5) =79a(6) =331a(7) =479a(8) =493a(9) =5297a(10) =2701a(11) =69071a(12) =70061a(13) =69203a(14) =55963a(15) =471181a(16) =158395a(17) =8960447a(18) =45108541a(19) =44831407a(20) =45083347a(21) =1031626241a(22) =518238043a(23) =5160071143a(24) =5180664331a(25) =15484789693a(26) =15537907043a(27) =64166447971a(28) =64357670431