OFFSET
1,2
COMMENTS
a(n) = A007980(n-1) * n.
LINKS
Index entries for linear recurrences with constant coefficients, signature (2,-1,2,-4,2,-1,2,-1).
FORMULA
G.f.: x*(2*x^5+2*x^4+6*x^3+5*x^2+2*x+1) / ((x-1)^4*(x^2+x+1)^2). - Colin Barker, Mar 31 2013
PROG
(Haskell) See A033291.
CROSSREFS
KEYWORD
nonn
AUTHOR
Reinhard Zumkeller, Jul 08 2011
STATUS
approved