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Search: id:A160407
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| 1, 1, 2, 2, 2, 2, 4, 4, 2, 2, 4, 4, 4, 6, 10, 8, 2, 2, 4, 4, 4, 6, 10, 8, 4, 6, 10, 10, 12, 20, 26, 16, 2, 2, 4, 4, 4, 6, 10, 8, 4, 6, 10, 10, 12, 20, 26, 16, 4, 6, 10, 10, 12, 20, 26, 18, 12, 20, 28, 30, 42
(list; graph; listen)
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OFFSET
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1,3
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COMMENT
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Number of toothpick placed in the sieve at round n.
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EXAMPLE
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Contribution from Omar E. Pol (info(AT)polprimos.com), Jul 18 2009: (Start)
If written as a triangle:
1;
1;
2,2;
2,2,4,4;
2,2,4,4,4,6,10,8;
2,2,4,4,4,6,10,8,4,6,10,10,12,20,26,16;
2,2,4,4,4,6,10,8,4,6,10,10,12,20,26,16,4,6,10,10,12,20,26,18,12,20,28,30,42;...
(End)
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CROSSREFS
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Cf. A139250, A139251, A153000, A153006, A152980, A160406.
Cf. A161830, A161831. [From Omar E. Pol (info(AT)polprimos.com), Jul 18 2009]
Sequence in context: A051464 A060632 A151565 this_sequence A007457 A119802 A060369
Adjacent sequences: A160404 A160405 A160406 this_sequence A160408 A160409 A160410
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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 23 2009
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EXTENSIONS
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More terms from N. J. A. Sloane, Jul 17 2009
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