a(n) = (1/s(1) + 1/s(2) + ... + 1/s(n+1)) * LCM{1, 2, ..., n}, where s(k) = LCM{1,2,...,k}/k = A002944(k).

A025537

a(n) = (1/s(1) + 1/s(2) + ... + 1/s(n+1)) * LCM{1, 2, ..., n}, where s(k) = LCM{1,2,...,k}/k = A002944(k).

Terms

    a(0) =1a(1) =2a(2) =5a(3) =17a(4) =35a(5) =181a(6) =182a(7) =1278a(8) =2559a(9) =7687a(10) =7688a(11) =84580a(12) =84581a(13) =1099567a(14) =1099582a(15) =1099590a(16) =2199181a(17) =37386095a(18) =37386096a(19) =710335844a(20) =710335865a(21) =710335887a(22) =710335888a(23) =16337725448a(24) =16337725453a(25) =81688627291a(26) =81688627300a(27) =245065881928a(28) =245065881929

External references