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A188344 Number of circles present in the n-th generation of the Q-toothpick sequence A187210. 4
0, 0, 0, 1, 1, 3, 3, 3, 9, 13, 15, 15, 21, 25, 27, 31, 45, 53, 55, 55, 61, 65, 67, 71, 85, 93, 95, 99, 113, 121, 127, 147, 181, 197, 199, 199, 205, 209, 211, 215, 229, 237, 239, 243, 257, 265, 271, 291, 325, 341, 343 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,6

COMMENTS

See A187210 for a description of the different shapes that appear in the Q-toothpick sequence.

LINKS

Nathaniel Johnston, Table of n, a(n) for n = 0..181

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.]

Nathaniel Johnston, The Q-Toothpick Cellular Automaton

N. J. A. Sloane, Catalog of Toothpick and Cellular Automata Sequences in the OEIS

CROSSREFS

Cf. A187210, A188345, A188346.

Sequence in context: A060828 A332337 A161808 * A217457 A231753 A231663

Adjacent sequences:  A188341 A188342 A188343 * A188345 A188346 A188347

KEYWORD

nonn

AUTHOR

Nathaniel Johnston, Mar 28 2011

STATUS

approved

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Last modified March 29 02:19 EDT 2020. Contains 333104 sequences. (Running on oeis4.)