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A161832
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a(n) = (A161830(n+1)-1)/2.
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3
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0, 1, 2, 4, 5, 7, 9, 13, 15, 17, 19, 23, 26, 30, 35, 44, 49, 51
(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 in the structure after n rounds. A161833 (the first differences) gives the number added at the n-th round.
See the Y-toothpick sequence A160120 and A161830 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
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CROSSREFS
| Cf. A139250, A160120, A160406, A161830, A161831, A161833.
Sequence in context: A056833 A105771 A193494 * A078404 A056908 A060565
Adjacent sequences: A161829 A161830 A161831 * A161833 A161834 A161835
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KEYWORD
| more,nonn
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AUTHOR
| Omar E. Pol (info(AT)polprimos.com), Jun 20 2009
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