OFFSET
0,2
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 0..200
Index entries for linear recurrences with constant coefficients, signature (19, -119, 281, -180).
FORMULA
a(0)=1, a(1)=19, a(2)=242, a(3)=2618, a(n)=19*a(n-1)-119*a(n-2)+ 281*a(n-3)- 180*a(n-4). [Harvey P. Dale, Jul 23 2011]
a(n) = (3*9^(n+3)-30*5^(n+3)+32*4^(n+3)-5)/480. - Yahia Kahloune, May 23 2013.
MATHEMATICA
CoefficientList[Series[1/((1-x)(1-4x)(1-5x)(1-9x)), {x, 0, 40}], x] (* or *) LinearRecurrence[{19, -119, 281, -180}, {1, 19, 242, 2618}, 41] (* Harvey P. Dale, Jul 23 2011 *)
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
STATUS
approved