A172031 - OEIS

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A172031

Denominator of the fraction c(n) defined in A172030.

1, 1, 2, 6, 3, 30, 15, 70, 35, 210, 105, 2310, 1155, 10010, 5005, 30030, 15015, 510510, 255255, 3233230, 1616615, 1939938, 969969, 44618574, 22309287, 74364290, 37182145, 223092870, 111546435, 6469693230, 3234846615, 66853496710, 33426748355, 200560490130

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OFFSET

0,3

LINKS

Table of n, a(n) for n=0..33.

MATHEMATICA

c[n_] := 2*c[n-1] + BernoulliB[n-1]; c[0] = 0; c[1] = 1; c[2] = 5/2; a[n_] := c[n] // Denominator; Table[a[n], {n, 0, 33}] (* Jean-François Alcover, Apr 15 2013 *)

CROSSREFS

Sequence in context: A307540 A304087 A284003 * A111678 A206429 A101819

Adjacent sequences: A172028 A172029 A172030 * A172032 A172033 A172034

KEYWORD

nonn,frac

AUTHOR

Paul Curtz, Jan 23 2010

EXTENSIONS

Edited and extended by R. J. Mathar, Mar 14 2010

STATUS

approved