Numerator - denominator in n-th harmonic number, 1 + 1/2 + 1/3 + ... + 1/n.

Terms

a(0) =0a(1) =1a(2) =5a(3) =13a(4) =77a(5) =29a(6) =223a(7) =481a(8) =4609a(9) =4861a(10) =55991a(11) =58301a(12) =785633a(13) =811373a(14) =835397a(15) =1715839a(16) =29889983a(17) =10190221a(18) =197698279a(19) =40315631a(20) =13684885a(21) =13920029a(22) =325333835a(23) =990874363a(24) =25128807667a(25) =25472027467a(26) =232222818803a(27) =235091155703