OFFSET
0,4
COMMENTS
Note that if n > 1 is a power of 2 then a(n) = n^2 - 2n.
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(2^k) = A211012(k). - Omar E. Pol, Sep 25 2012
CROSSREFS
KEYWORD
nonn
AUTHOR
Omar E. Pol, Apr 28 2009
EXTENSIONS
More terms from Omar E. Pol, Sep 25 2012
STATUS
approved