OFFSET
0,2
COMMENTS
FORMULA
a(0) = 1, a(1) = 3, a(n) = 0 for n > 1.
G.f.: 1+3*x.
PROG
(PARI) {concat([1, 3], vector(103))}
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Klaus Brockhaus, Dec 02 2009
STATUS
approved