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A114000 Triangle read by rows: column k has g.f. = Sum_{k>0} x^k/(1-x^(2*k+1)). 2
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; table; graph; refs; listen; history; text; internal format)
OFFSET

0,1

COMMENTS

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

LINKS

Table of n, a(n) for n=0..104.

EXAMPLE

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

...

CROSSREFS

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

KEYWORD

easy,nonn,tabl

AUTHOR

Paul Barry, Nov 12 2005

EXTENSIONS

Edited by N. J. A. Sloane, Dec 23 2020

STATUS

approved

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Last modified February 7 12:18 EST 2023. Contains 360116 sequences. (Running on oeis4.)