



1, 3, 9, 12, 6, 3, 9, 12, 6, 3, 9, 12, 6, 3, 9, 12, 6, 3, 9, 12, 6, 3, 9, 12, 6, 3, 9, 12, 6, 3, 9, 12, 6, 3, 9, 12, 6, 3, 9, 12, 6, 3, 9, 12, 6, 3, 9, 12, 6, 3, 9, 12, 6, 3, 9, 12, 6, 3, 9, 12, 6, 3, 9, 12, 6, 3, 9, 12, 6, 3, 9, 12, 6, 3, 9, 12, 6, 3, 9, 12, 6, 3, 9, 12, 6, 3, 9, 12, 6, 3
(list;
graph;
refs;
listen;
history;
text;
internal format)



OFFSET

0,2


LINKS



FORMULA

a(n) = a(n1) a(n2) +a(n3), n>3.
G.f.: (1 + 2*x + 7*x^2 + 5*x^3)/((1x)*(1+x^2)). (End)


MATHEMATICA



PROG

(Sage) [power_mod(3, n, 15) for n in range(0, 90)]


CROSSREFS



KEYWORD

nonn,easy


AUTHOR



STATUS

approved



