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A182635 Number of toothpicks added at n-th stage to the toothpick structure of A182634. 8
0, 1, 2, 4, 4, 4, 8, 12, 8, 4, 8, 16, 20, 16, 20, 28, 16, 4, 8, 16, 20, 20, 28, 44, 44, 24, 20, 40, 56, 48, 52, 64, 32, 4, 8, 16, 20, 20, 28, 44, 44, 28, 28, 52, 76, 76, 76 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,3
COMMENTS
First differences of A182634.
First differs from A139251 at a(11).
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) = A182633(n)/3.
EXAMPLE
Contribution from Omar E. Pol, Dec 06 2012 (Start):
When written as an irregular triangle begins:
0;
1;
2;
4,4;
4,8,12,8;
4,8,16,20,16,20,28,16;
4,8,16,20,20,28,44,44,24,20,40,56,48,52,64,32;
4,8,16,20,20,28,44,44,28,28,52,76,76,76,...
(End)
CROSSREFS
Sequence in context: A160809 A139251 A342272 * A188346 A309690 A173531
KEYWORD
nonn,more
AUTHOR
Omar E. Pol, Dec 08 2010
STATUS
approved

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Last modified May 21 12:47 EDT 2024. Contains 372736 sequences. (Running on oeis4.)