OFFSET
1,1
LINKS
Index entries for linear recurrences with constant coefficients, signature (4,-6,4,-1).
FORMULA
a(n)=12*n^3-15*n^2+6*n-1 .
G.f.: x*(2+39*x+30*x^2+x^3) / (x-1)^4 . - R. J. Mathar, Apr 26 2015
MATHEMATICA
LinearRecurrence[{4, -6, 4, -1}, {2, 47, 206, 551}, 50] (* Harvey P. Dale, Jun 16 2018 *)
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Philippe Deléham, Apr 11 2007
STATUS
approved