OFFSET
1,2
LINKS
David Applegate, Omar E. Pol and N. J. A. Sloane, The Toothpick Sequence and Other Sequences from Cellular Automata, Congressus Numerantium, Vol. 206 (2010), 157-191. [There is a typo in Theorem 6: (13) should read u(n) = 4.3^(wt(n-1)-1) for n >= 2.]
N. J. A. Sloane, Catalog of Toothpick and Cellular Automata Sequences in the OEIS
FORMULA
a(n) = 3*A001316(n-1) - 2
CROSSREFS
KEYWORD
nonn
AUTHOR
Omar E. Pol, May 25 2009
EXTENSIONS
Formula and more terms from Max Alekseyev, Sep 08 2011
STATUS
approved