OFFSET
0,1
LINKS
T. D. Noe, Table of n, a(n) for n = 0..200
Index entries for linear recurrences with constant coefficients, signature (60,-1375,15960,-103348,383040,-792000,829440,-331776).
FORMULA
G.f.: -2*(414720*x^7 -792000*x^6 +574560*x^5 -206696*x^4 +39900*x^3 -4125*x^2 +210*x -4) / ((x -1)*(2*x -1)*(3*x -1)*(4*x -1)*(6*x -1)*(8*x -1)*(12*x -1)*(24*x -1)). - Colin Barker, Apr 20 2014
MATHEMATICA
Total[#^Range[0, 20]&/@Divisors[24]] (* Vincenzo Librandi, Apr 17 2014 *)
PROG
(Sage) [sigma(24, n)for n in range(0, 16)] # Zerinvary Lajos, Jun 04 2009
(Magma) [DivisorSigma(n, 24): n in [0..20]]; // Vincenzo Librandi, Apr 17 2014
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
STATUS
approved