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A161828 Number of rhombuses in the Y-toothpick structure of A160120 after n rounds. 10
0, 0, 3, 3, 9, 9, 15, 21, 33, 39 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..9.

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, A160120, A160124, A161419, A161418, A161836.

Sequence in context: A204099 A062234 A168329 * A219128 A217964 A086739

Adjacent sequences:  A161825 A161826 A161827 * A161829 A161830 A161831

KEYWORD

more,nonn

AUTHOR

Omar E. Pol, Jun 21 2009

STATUS

approved

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Last modified February 26 11:03 EST 2020. Contains 332279 sequences. (Running on oeis4.)