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A160158 Toothpick sequence starting from a segment of length 4 formed by two toothpicks. 5
0, 2, 4, 8, 16, 24, 28, 36, 48, 56, 64, 80, 104, 124, 136, 156, 176, 184, 192, 208, 232, 252, 268, 296, 328, 352, 384, 440, 508, 560, 600, 652, 688, 696, 704, 720, 744, 764, 780, 808, 840, 864, 896, 952, 1020, 1072, 1116, 1176, 1224, 1248, 1280, 1336, 1404 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

The sequence gives the number of toothpicks in the sieve after n-th stage.

LINKS

Table of n, a(n) for n=0..52.

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

CROSSREFS

Cf. A139250, A160406, A160730, A160732, A160736, A160738, A160740.

Sequence in context: A108567 A261890 A072874 * A010072 A318654 A305656

Adjacent sequences:  A160155 A160156 A160157 * A160159 A160160 A160161

KEYWORD

nonn

AUTHOR

Omar E. Pol, May 29 2009

EXTENSIONS

Extended beyond a(13) by R. J. Mathar, Jun 01 2009

STATUS

approved

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Last modified January 22 01:47 EST 2019. Contains 319351 sequences. (Running on oeis4.)