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A160049 Denominator of the Harary number for the path graph P_n. 1
1, 1, 1, 3, 6, 5, 10, 35, 140, 126, 1260, 1155, 13860, 12870, 12012, 45045, 360360, 340340, 2042040, 1939938, 369512, 117572, 2586584, 7436429, 178474296, 171609900, 1487285800, 1434168450, 40156716600, 38818159380, 1164544781400 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

COMMENTS

Is this the same as A096620? - R. J. Mathar, Jan 26 2010

LINKS

Table of n, a(n) for n=1..31.

Eric Weisstein's World of Mathematics, Harary Index

EXAMPLE

0, 2, 5, 26/3, 77/6, 87/5, 223/10, 962/35, 4609/140, 4861/126, ...

CROSSREFS

Cf. A160048.

Sequence in context: A118413 A096620 A093419 * A007479 A076535 A239487

Adjacent sequences:  A160046 A160047 A160048 * A160050 A160051 A160052

KEYWORD

nonn

AUTHOR

Eric W. Weisstein, Apr 30 2009

STATUS

approved

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Last modified March 24 05:55 EDT 2017. Contains 283984 sequences.