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A114000
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Triangle read by rows: column k has g.f. = Sum_{k>0} x^k/(1-x^(2*k+1)).
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2
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1, 1, 1, 1, 0, 1, 1, 0, 0, 1, 1, 1, 0, 0, 1, 1, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 0, 1, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1
(list;
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refs;
listen;
history;
text;
internal format)
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OFFSET
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0,1
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COMMENTS
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Number triangle related to divisors of 2n+1. Row n has a 1 in column k iff 2*k+1 divides 2*n+1. - N. J. A. Sloane, Dec 23 2020
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LINKS
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Table of n, a(n) for n=0..104.
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EXAMPLE
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Triangle begins
1
1, 1,
1, 0, 1,
1, 0, 0, 1,
1, 1, 0, 0, 1,
1, 0, 0, 0, 0, 1,
1, 0, 0, 0, 0, 0, 1,
1, 1, 1, 0, 0, 0, 0, 1,
1, 0, 0, 0, 0, 0, 0, 0, 1,
1, 0, 0, 0, 0, 0, 0, 0, 0, 1,
1, 1, 0, 1, 0, 0, 0, 0, 0, 0, 1,
1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1,
1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1,
1, 1, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1
...
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CROSSREFS
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Cf. A001227, A082647, A131576.
Rows sums are A099774. Rows as decimals give A114001.
Sequence in context: A158856 A154957 A140865 * A131218 A174391 A343910
Adjacent sequences: A113997 A113998 A113999 * A114001 A114002 A114003
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KEYWORD
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easy,nonn,tabl
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AUTHOR
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Paul Barry, Nov 12 2005
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EXTENSIONS
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Edited by N. J. A. Sloane, Dec 23 2020
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STATUS
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approved
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