OFFSET
0,1
LINKS
Alois P. Heinz, Table of n, a(n) for n = 0..1000
FORMULA
a(n) = Sum_{k=1..4} A066633(4,k) * k^n.
a(n) = 7 + 3*2^n + 3^n + 4^n.
G.f.: -2*(109*x^3-132*x^2+50*x-6)/((x-1)*(2*x-1)*(3*x-1)*(4*x-1)).
MAPLE
a:= n-> 7+3*2^n+3^n+4^n:
seq(a(n), n=0..30);
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Alois P. Heinz, Sep 20 2013
STATUS
approved