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A160721
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First differences of A160720.
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3
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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, 28, 60, 28, 60, 60, 124, 28, 60, 60, 124, 60, 124, 124, 252, 4, 12, 12, 28, 12, 28, 28
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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COMMENTS
| 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
| 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
David Applegate, The movie version [From Omar E. Pol (info(AT)polprimos.com), Jul 23 2009]
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FORMULA
| 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
| Cf. A139250, A139251, A160720, A160722, A160723.
Cf. A000120, A001316, A038573. [From Omar E. Pol (info(AT)polprimos.com), Jul 23 2009]
Sequence in context: A048223 A014012 A178182 * A151836 A147582 A162793
Adjacent sequences: A160718 A160719 A160720 * A160722 A160723 A160724
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KEYWORD
| nonn
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AUTHOR
| Omar E. Pol (info(AT)polprimos.com), May 25 2009, May 29 2009
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EXTENSIONS
| More terms from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jul 14 2009
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