a(n) = 3*a(n-2) for n > 2; a(1) = 1, a(2) = 3.
1, 3, 3, 9, 9, 27, 27, 81, 81, 243, 243, 729, 729, 2187, 2187, 6561, 6561, 19683
1 seqfan posts
Sat Jan 8 22:59:36 CET 2011 [seqfan] 2nd email; "Clonacci numbers, from interpretation of Brandon, R., 1990, Adaptation and Environment. Princeton: Princeton University Press."