G.f.: A(x) = exp( Sum_{n>=1} sigma(n^4)*x^n/n ), a power series in x with integer coefficients.
A202993
G.f.: A(x) = exp( Sum_{n>=1} sigma(n^4)*x^n/n ), a power series in x with integer coefficients.
Terms
- a(0) =1a(1) =1a(2) =16a(3) =56a(4) =296a(5) =1052a(6) =4952a(7) =17292a(8) =70512a(9) =249712a(10) =931226a(11) =3212690a(12) =11399590a(13) =38331770a(14) =130310820a(15) =428389292a(16) =1408697596a(17) =4524980036a(18) =14486512316a(19) =45558807176a(20) =142488702483a(21) =439559056419
External references
- oeis: A202993