OFFSET
0,6
COMMENTS
See A187210 for a description of the different shapes that appear in the Q-toothpick sequence.
LINKS
Nathaniel Johnston, Table of n, a(n) for n = 0..181
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.]
Nathaniel Johnston, The Q-Toothpick Cellular Automaton
N. J. A. Sloane, Catalog of Toothpick and Cellular Automata Sequences in the OEIS
FORMULA
It appears that a(n) = A211008(n-2,2), n >= 3. (Checked by hand up n = 130 in the toothpick structure of A139250). - Omar E. Pol, Sep 25 2012
CROSSREFS
KEYWORD
nonn
AUTHOR
Nathaniel Johnston, Mar 28 2011
STATUS
approved