Denominator of the harmonic mean of the first n positive integers.

Terms

a(0) =1a(1) =3a(2) =11a(3) =25a(4) =137a(5) =49a(6) =363a(7) =761a(8) =7129a(9) =7381a(10) =83711a(11) =86021a(12) =1145993a(13) =1171733a(14) =1195757a(15) =2436559a(16) =42142223a(17) =14274301a(18) =275295799a(19) =11167027a(20) =18858053a(21) =19093197a(22) =444316699a(23) =1347822955a(24) =34052522467a(25) =34395742267a(26) =312536252003a(27) =315404588903