OFFSET
0,2
LINKS
Index entries for linear recurrences with constant coefficients, signature (20, -137, 382, -360).
FORMULA
a(0)=1, a(1)=20, a(2)=263, a(3)=2902, a(n)=20*a(n-1)-137*a(n-2)+ 382*a(n-3)- 360*a(n-4). [Harvey P. Dale, Dec 08 2011]
a(n) = -4*2^n/21 +32*4^n/5 -125*5^n/12 +729*9^n/140. - R. J. Mathar, Jun 20 2013
MATHEMATICA
CoefficientList[Series[1/((1-2x)(1-4x)(1-5x)(1-9x)), {x, 0, 30}], x] (* or *) LinearRecurrence[{20, -137, 382, -360}, {1, 20, 263, 2902}, 30] (* Harvey P. Dale, Dec 08 2011 *)
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
STATUS
approved