OFFSET
0,2
LINKS
Index entries for linear recurrences with constant coefficients, signature (21, -148, 420, -400).
FORMULA
a(n) = -2^n/6 +16*4^n/3 -25*5^n/3 +25*10^n/6. - R. J. Mathar, Jun 20 2013
MATHEMATICA
CoefficientList[Series[1/((1-2x)(1-4x)(1-5x)(1-10x)), {x, 0, 20}], x] (* or *) LinearRecurrence[{21, -148, 420, -400}, {1, 21, 293, 3465}, 20] (* Harvey P. Dale, Mar 28 2024 *)
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
STATUS
approved