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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

Table of n, a(n) for n=0..46.

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

Index entries for sequences related to toothpick sequences

Index entries for sequences related to cellular automata

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

Cf. A139250, A139251, A160121, A161207, A161645, A182633, A182634, A194445.

Sequence in context: A160809 A139251 A342272 * A188346 A309690 A173531

Adjacent sequences:  A182632 A182633 A182634 * A182636 A182637 A182638

KEYWORD

nonn,more

AUTHOR

Omar E. Pol, Dec 08 2010

STATUS

approved

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Last modified September 20 16:50 EDT 2021. Contains 347586 sequences. (Running on oeis4.)