OFFSET
4,4
REFERENCES
H. Petersson, Modulfunktionen und Quadratische Formen, Springer-Verlag, 1982; p. 186.
LINKS
Index entries for linear recurrences with constant coefficients, signature (1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,-1).
FORMULA
a(n+24m) = a(n) + 12m for m >= 1.
a(n)= +a(n-1) +a(n-24) -a(n-25). - R. J. Mathar, Oct 01 2011
G.f.: x^4*(1 + x^3 + x^5 + x^6 + x^9 + x^12 + x^13 + x^15 + x^18 + 3*x^21) / ((1 - x)^2*(1 + x)*(1 - x + x^2)*(1 + x^2)*(1 + x + x^2)*(1 - x^2 + x^4)*(1 + x^4)*(1 - x^4 + x^8)). - Colin Barker, Jun 06 2019
MATHEMATICA
LinearRecurrence[{1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, -1}, {1, 1, 1, 2, 2, 3, 4, 4, 4, 5, 5, 5, 6, 7, 7, 8, 8, 8, 9, 9, 9, 12, 12, 12, 13}, 120] (* Harvey P. Dale, May 11 2016 *)
PROG
(PARI) Vec(x^4*(1 + x^3 + x^5 + x^6 + x^9 + x^12 + x^13 + x^15 + x^18 + 3*x^21) / ((1 - x)^2*(1 + x)*(1 - x + x^2)*(1 + x^2)*(1 + x + x^2)*(1 - x^2 + x^4)*(1 + x^4)*(1 - x^4 + x^8)) + O(x^40)) \\ Colin Barker, Jun 06 2019
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
N. J. A. Sloane, Aug 27 2004
STATUS
approved