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A124305
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Riordan array (1,2*sqrt(3)*sin(asin(3*sqrt(3)*x/2)/3)/3).
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3
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1, 0, 1, 0, 0, 1, 0, 1, 0, 1, 0, 0, 2, 0, 1, 0, 3, 0, 3, 0, 1, 0, 0, 7, 0, 4, 0, 1, 0, 12, 0, 12, 0, 5, 0, 1, 0, 0, 30, 0, 18, 0, 6, 0, 1, 0, 55, 0, 55, 0, 25, 0, 7, 0, 1, 0, 0, 143, 0, 88, 0, 33, 0, 8, 0, 1
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OFFSET
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0,13
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COMMENTS
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Inverse of A124304. Row sums are A047749. Diagonal sums appear to be aerated version of A098746.
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LINKS
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Table of n, a(n) for n=0..65.
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EXAMPLE
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Triangle begins
.1,
.0, 1,
.0, 0, 1,
.0, 1, 0, 1,
.0, 0, 2, 0, 1,
.0, 3, 0, 3, 0, 1,
.0, 0, 7, 0, 4, 0, 1,
.0, 12, 0, 12, 0, 5, 0, 1
Contribution from Paul Barry, Sep 28 2009: (Start)
Production matrix is
0, 1,
0, 0, 1,
0, 1, 0, 1,
0, 0, 1, 0, 1,
0, 1, 0, 1, 0, 1,
0, 0, 1, 0, 1, 0, 1,
0, 1, 0, 1, 0, 1, 0, 1,
0, 0, 1, 0, 1, 0, 1, 0, 1,
0, 1, 0, 1, 0, 1, 0, 1, 0, 1,
0, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1 (End)
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CROSSREFS
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Sequence in context: A052173 A175790 A177825 * A087073 A106844 A125989
Adjacent sequences: A124302 A124303 A124304 * A124306 A124307 A124308
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KEYWORD
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easy,nonn,tabl
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AUTHOR
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Paul Barry, Oct 25 2006
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STATUS
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approved
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