G.f.: A(x) = exp( Sum_{n>=1} A179307(n)*x^n/n ), where A179307(n) = Sum_{d|n} C(n,d)*sigma(d)*sigma(n/d).

A179306

G.f.: A(x) = exp( Sum_{n>=1} A179307(n)*x^n/n ), where A179307(n) = Sum_{d|n} C(n,d)*sigma(d)*sigma(n/d).

Terms

    a(0) =1a(1) =1a(2) =5a(3) =10a(4) =40a(5) =67a(6) =262a(7) =449a(8) =1572a(9) =2915a(10) =8876a(11) =16452a(12) =51811a(13) =93789a(14) =271500a(15) =518378a(16) =1457658a(17) =2734005a(18) =7584475a(19) =14282412a(20) =38649578a(21) =73773173a(22) =193491639a(23) =369696321a(24) =971226618a(25) =1845956358a(26) =4730626121a(27) =9114534520a(28) =23083308650a(29) =44287157822

External references