OFFSET
0,1
REFERENCES
J.-P. Serre, Course in Arithmetic, Chap. VII, Section 4.
LINKS
FORMULA
MATHEMATICA
terms = 14;
E20[x_] = 174611 + 13200*Sum[k^19*x^k/(1 - x^k), {k, 1, terms}];
E20[x] + O[x]^terms // CoefficientList[#, x]& (* Jean-François Alcover, Feb 27 2018 *)
PROG
(PARI) a(n)=if(n<1, 174611*(n==0), 13200*sigma(n, 19))
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
STATUS
approved