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Search: id:A160721
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| 1, 4, 4, 12, 4, 12, 12, 28, 4, 12, 12, 28, 12, 28, 28, 60, 4, 12, 12, 28, 12, 28, 28, 60, 12, 28, 28, 60, 28, 60, 60, 124, 4, 12, 12, 28, 12, 28, 28, 60, 12, 28, 28, 60, 28, 60, 60, 124, 12, 28
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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This sequence is related to the Sierpinski triangle and to the Gould's sequence A001316. [From Omar E. Pol (info(AT)polprimos.com), Jul 23 2009]
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LINKS
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David Applegate, The movie version [From Omar E. Pol (info(AT)polprimos.com), Jul 23 2009]
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FORMULA
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a(1)=1. Observation: It appears that a(n) = 4*A038573(n-1), n>1. [From Omar E. Pol (info(AT)polprimos.com), Jul 23 2009]
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CROSSREFS
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Cf. A139250, A139251, A160720, A160722, A160723.
Cf. A000120, A001316, A038573. [From Omar E. Pol (info(AT)polprimos.com), Jul 23 2009]
Sequence in context: A128499 A048223 A014012 this_sequence A151836 A147582 A162793
Adjacent sequences: A160718 A160719 A160720 this_sequence A160722 A160723 A160724
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KEYWORD
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more,nonn
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AUTHOR
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Omar E. Pol (info(AT)polprimos.com), May 25 2009, May 29 2009
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EXTENSIONS
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More terms from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jul 14 2009
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