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

Terms

a(0) =3a(1) =9a(2) =25a(3) =125a(4) =147a(5) =343a(6) =761a(7) =6849a(8) =7381a(9) =81191a(10) =86021a(11) =1118273a(12) =1171733a(13) =1171733a(14) =2436559a(15) =41421503a(16) =42822903a(17) =271211719a(18) =279175675a(19) =55835135a(20) =19093197a(21) =439143531a(22) =1347822955a(23) =33695573875a(24) =34395742267a(25) =309561680403a(26) =315404588903