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A161332
a(n) = A161331(n)/2.
1
0, 1, 3, 3, 3, 9, 3, 9, 9, 9, 15, 9, 15, 21, 3, 9, 9, 15, 27, 15, 39, 21, 27, 39, 21, 33, 39, 9, 21, 21, 27, 45, 33, 63, 45, 45, 51, 33, 39, 45, 45, 45, 27, 33, 57, 39, 63, 63, 51, 51, 69, 51, 81, 51, 57, 81, 63, 81, 57, 51, 51, 63, 93, 93, 75, 69, 63
OFFSET
0,3
COMMENTS
Number of E-toothpicks added at n-th stage to the structure of A161334. - Omar E. Pol, Jan 07 2014
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, A single E-toothpick รง
CROSSREFS
KEYWORD
nonn
AUTHOR
Omar E. Pol, Jun 07 2009
EXTENSIONS
More terms from Omar E. Pol, Jan 07 2014
STATUS
approved