OFFSET
0,2
LINKS
Index entries for linear recurrences with constant coefficients, signature (19,-131,389,-420).
FORMULA
a(n) = (7^(n+3)-6*5^(n+3)+8*4^(n+3)-3^(n+4))/24. - Yahia Kahloune, May 22 2013.
MATHEMATICA
CoefficientList[Series[1/((1-3x)(1-4x)(1-5x)(1-7x)), {x, 0, 20}], x] (* Harvey P. Dale, Apr 05 2019 *)
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
STATUS
approved