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A161418
Number of triangles in the Y-toothpick structure after n rounds.
5
0, 0, 0, 0, 6, 6, 12, 12, 24, 30
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OFFSET
0,5
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
,
A161828
,
A161836
.
Sequence in context:
A315784
A315785
A127402
*
A124691
A315786
A112437
Adjacent sequences:
A161415
A161416
A161417
*
A161419
A161420
A161421
KEYWORD
more
,
nonn
AUTHOR
Omar E. Pol
, Jun 21 2009
STATUS
approved
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Last modified April 27 12:36 EDT 2024. Contains 372019 sequences. (Running on oeis4.)