Denominator of H(n)/H(n-1), where H(n) is the n-th harmonic number = Sum_{k=1..n} 1/k.

Terms

a(0) =2a(1) =9a(2) =22a(3) =125a(4) =137a(5) =343a(6) =726a(7) =6849a(8) =7129a(9) =81191a(10) =83711a(11) =1118273a(12) =1145993a(13) =1171733a(14) =2391514a(15) =41421503a(16) =42142223a(17) =271211719a(18) =275295799a(19) =55835135a(20) =18858053a(21) =439143531a(22) =1332950097a(23) =33695573875a(24) =34052522467a(25) =309561680403a(26) =312536252003