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Search: id:A160121
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| 1, 3, 3, 9, 3, 9, 9, 21, 9, 9, 9, 21, 15, 21, 27, 51, 27, 9, 9, 21, 15, 21, 27, 51, 33, 21, 27, 51, 51, 57, 69, 117, 81, 21, 9, 21, 15, 21, 27, 51, 33, 21, 27, 51, 51, 57, 69, 117, 87, 33, 27, 51, 51, 57, 75, 129, 117, 75, 69, 117, 135, 141, 171, 279, 231, 69, 9, 21, 15, 21, 27
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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Number of Y-Toothpicks added to the Y-Toothpick sieve at the n-th stage.
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LINKS
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David Applegate, The movie version
O. E. Pol, Illustration of initial terms of A139251, A160121, A147582 (Overlapping figures) [From Omar E. Pol (info(AT)polprimos.com), Nov 02 2009]
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EXAMPLE
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Contribution from Omar E. Pol (info(AT)polprimos.com), Jun 18 2009: (Start)
May be written as a triangle:
1,
3,
3,
9,
3,9,
9,21,9,9,
9,21,15,21,27,51,27,9,
9,21,15,21,27,51,33,21,27,51,51,57,69,117,81,21,
9,21,15,21,27,51,33,21,27,51,51,57,69,117,87,33,27,51,51,57,75,129,117,75,...
Rows converge to A161326.
(End)
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CROSSREFS
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Y-Toothpick sequence: A160120.
Cf. A139251.
Cf. A160171, A160173, A161207, A161329, A161331.
Cf. A161326, A161431. [From Omar E. Pol (info(AT)polprimos.com), Jun 18 2009]
Cf. A147582. [From Omar E. Pol (info(AT)polprimos.com), Nov 02 2009]
Sequence in context: A145444 A165824 A151710 this_sequence A048883 A036553 A166466
Adjacent sequences: A160118 A160119 A160120 this_sequence A160122 A160123 A160124
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KEYWORD
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nonn
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AUTHOR
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Omar E. Pol (info(AT)polprimos.com), May 02 2009
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EXTENSIONS
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More terms from David Applegate (david(AT)research.att.com), Jun 14 2009
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