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A153004 First differences of toothpick numbers A153003. 7
1, 3, 3, 3, 6, 9, 6, 3, 6, 9, 9, 12, 21, 24, 12, 3, 6, 9, 9, 12, 21, 24, 15, 12, 21, 27, 30, 45, 66, 60, 24, 3, 6, 9, 9, 12, 21, 24, 15, 12, 21, 27, 30, 45, 66, 60, 27, 12, 21, 27, 30, 45, 66, 63, 42, 45, 69, 84, 105, 156, 192, 144, 48, 3 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..64.

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

EXAMPLE

Triangle begins:

1;

3,3;

3,6,9,6;

3,6,9,9,12,21,24,12;

3,6,9,9,12,21,24,15,12,21,27,30,45,66,60,24;

CROSSREFS

Cf. A139251, A152968, A152978, A152998, A153000, A153003.

Toothpick sequence: A139250.

Sequence in context: A058675 A025497 A031502 * A214361 A124449 A262877

Adjacent sequences:  A153001 A153002 A153003 * A153005 A153006 A153007

KEYWORD

nonn

AUTHOR

Omar E. Pol, Jan 02 2009

STATUS

approved

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Last modified January 16 19:49 EST 2019. Contains 319206 sequences. (Running on oeis4.)