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A161426
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Y-toothpick sequence starting at the outside corner of an infinite triangle-shaped polygon as the sieve of A160120 after 2^k rounds.
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2
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0, 1, 4, 7, 14, 19, 26, 35, 52, 63, 70
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,3
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COMMENTS
| The sequence gives the number of Y-toothpicks after n rounds. A161427 (the first differences) gives the number added at the n-th round.
See the entries A160120, A139250 and A153006 for more information.
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LINKS
| David Applegate, Omar E. Pol and N. J. A. Sloane, The Toothpick Sequence and Other Sequences from Cellular Automata
N. J. A. Sloane, Catalog of Toothpick and Cellular Automata Sequences in the OEIS
David Applegate, The movie version
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CROSSREFS
| Cf. A000079, A139250, A153006, A160120, A161427, A161830.
Sequence in context: A159912 A183060 A049766 * A115759 A157615 A188319
Adjacent sequences: A161423 A161424 A161425 * A161427 A161428 A161429
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KEYWORD
| more,nonn
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AUTHOR
| Omar E. Pol (info(AT)polprimos.com) and David Applegate (david(AT)research.att.com), Jun 20 2009
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