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Search: id:A079318
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| 1, 1, 1, 2, 1, 2, 2, 5, 1, 2, 2, 5, 2, 5, 5, 14, 1, 2, 2, 5, 2, 5, 5, 14, 2, 5, 5, 14, 5, 14, 14, 41, 1, 2, 2, 5, 2, 5, 5, 14, 2, 5, 5, 14, 5, 14, 14, 41, 2, 5, 5, 14, 5, 14, 14, 41, 5, 14, 14, 41, 14, 41, 41, 122, 1, 2, 2, 5, 2, 5, 5, 14, 2, 5, 5, 14, 5, 14, 14, 41, 2, 5, 5, 14, 5, 14, 14, 41, 5, 14, 14
(list; graph; listen)
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OFFSET
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0,4
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COMMENT
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For n>=1, a(n) mod 2 = A010060(n), the Thue-Morse sequence - Benoit Cloitre (benoit7848c(AT)orange.fr), Mar 23 2004
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REFERENCES
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D. Singmaster, On the cellular automaton of Ulam and Warburton, unpublished manuscript, 2003.
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FORMULA
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a(n)=sum(i+j+k=n, {n!/(i!*j!*k!)} mod 2 ) and 0<=k<=j<=i<=n. - Benoit Cloitre (benoit7848c(AT)orange.fr), Jul 02 2004
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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;
1,2;
1,2,2,5;
1,2,2,5,2,5,5,14;
1,2,2,5,2,5,5,14,2,5,5,14,5,14,14,41;
1,2,2,5,2,5,5,14,2,5,5,14,5,14,14,41,2,5,5,14,5,14,14,41,5,14,14,41,14,41,41,122;
(End)
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CROSSREFS
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Cf. A079314-A079319.
Cf. A092255.
Sequence in context: A117193 A026832 A089408 this_sequence A050315 A128978 A145862
Adjacent sequences: A079315 A079316 A079317 this_sequence A079319 A079320 A079321
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KEYWORD
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nonn,easy
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com), Feb 12 2003
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