Denominator of Sum_{k=1..n} k*H_{n+k} where H_m = Sum_{i=1..m} 1/i.

Terms

a(0) =1a(1) =2a(2) =1a(3) =1a(4) =6a(5) =4a(6) =20a(7) =5a(8) =70a(9) =56a(10) =504a(11) =420a(12) =4620a(13) =3960a(14) =3432a(15) =3003a(16) =90090a(17) =80080a(18) =1361360a(19) =408408a(20) =369512a(21) =67184a(22) =470288a(23) =1293292a(24) =29745716a(25) =27457584a(26) =228813200a(27) =212469400a(28) =5736673800a(29) =5354228880