OFFSET
0,2
LINKS
FORMULA
G.f.: (1 + x + x^2)/((1-x)^2*(1-2*x)).
a(n) = 2a(n-1) + 3n, n>0, a(0)=1.
a(n) = 4a(n-1) - 5a(n-2) + 2a(n-3).
MATHEMATICA
s=1; lst={s}; Do[s+=(s+=n)+n++; AppendTo[lst, s], {n, 1, 5!, 1}]; lst (* Vladimir Joseph Stephan Orlovsky, Nov 15 2008 *)
Table[7*2^n-3n-6, {n, 0, 30}] (* or *) LinearRecurrence[{4, -5, 2}, {1, 5, 16}, 30] (* Harvey P. Dale, Nov 15 2011 *)
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Paul Barry, Aug 25 2004
STATUS
approved