OFFSET
0,2
LINKS
Index entries for linear recurrences with constant coefficients, signature (20,-145,450,-504).
FORMULA
a(n) = (7^(n+3)-2*6^(n+3)+2*4^(n+3)-3^(n+3))/12. - Yahia Kahloune, May 30 2013
E.g.f.: exp(3*x)*(343*exp(4*x) - 432*exp(3*x) + 128*exp(x) - 27)/12. - Stefano Spezia, Sep 29 2022
MATHEMATICA
CoefficientList[Series[1/((1-3x)(1-4x)(1-6x)(1-7x)), {x, 0, 20}], x] (* Harvey P. Dale, Jan 09 2019 *)
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
STATUS
approved