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A161833
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First differences of A161832.
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3
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1, 1, 2, 1, 2, 2, 4, 2, 2, 2, 4, 3, 4, 5, 9, 5, 2
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,3
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COMMENTS
| Number of Y-toothpicks added to the sieve at the n-th round.
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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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FORMULA
| a(n) = A161831(n+1)/2.
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CROSSREFS
| Cf. A139251, A160121, A160407, A161830, A161831, A161832.
Sequence in context: A158379 A122838 A050378 * A139318 A205779 A205551
Adjacent sequences: A161830 A161831 A161832 * A161834 A161835 A161836
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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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