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A183149 Number of toothpicks added at n-th stage to the toothpick structure of A183148. 2
0, 1, 3, 9, 9, 21, 9, 21, 21, 57, 9, 21, 21, 57, 21, 57, 57, 165, 9, 21, 21, 57, 21, 57, 57, 165, 21, 57, 57, 165, 57, 165, 165, 489, 9, 21, 21, 57, 21, 57, 57, 165, 21, 57, 57, 165, 57, 165, 165, 489, 21, 57, 57, 165, 57, 165 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,3
COMMENTS
Essentially the first differences of A183148.
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.]
FORMULA
a(n) = 3*A183061(n-1), for n >=2
EXAMPLE
If written as a triangle begins:
0,
1,
3,
9,
9,21,
9,21,21,57,
9,21,21,57,21,57,57,165,
9,21,21,57,21,57,57,165,21,57,57,165,57,165,165,489,
CROSSREFS
Sequence in context: A223195 A203600 A099720 * A223933 A224057 A224310
KEYWORD
nonn
AUTHOR
Omar E. Pol, Mar 28 2011, Apr 02 2011
STATUS
approved

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Last modified June 21 19:01 EDT 2024. Contains 373557 sequences. (Running on oeis4.)