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A160714 T-toothpick sequence starting at the corner of an infinite square, but with angle = Pi/4. 3
0, 1, 2, 5, 6, 9, 12, 21, 22, 25, 28, 37, 40, 49, 58, 85, 112, 113 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

COMMENTS

The sequence gives the number of T-toothpicks after n rounds.

See A160172 for more information about T-toothpick sequences.

LINKS

Table of n, a(n) for n=0..17.

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, A160172, A160173.

Sequence in context: A267700 A161910 A151920 * A256644 A219764 A286003

Adjacent sequences:  A160711 A160712 A160713 * A160715 A160716 A160717

KEYWORD

more,nonn

AUTHOR

Omar E. Pol, Jun 02 2009

STATUS

approved

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Last modified October 15 22:25 EDT 2019. Contains 328038 sequences. (Running on oeis4.)