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A176729
Denominator of z-sequence for Sheffer triangle A060081.
4
1, 2, 1, 4, 1, 6, 1, 24, 1, 10, 1, 12, 1, 210, 1, 48, 1, 90, 1, 420, 1, 330, 1, 360, 1, 1638, 1, 28, 1, 30, 1, 7392, 1, 510, 1, 36, 1, 51870, 1, 840, 1, 6930, 1, 13860, 1, 4830, 1, 1008, 1, 99450, 1, 5148, 1, 2970, 1, 3192, 1, 870, 1, 180, 1, 2792790, 1, 137280, 1, 1530, 1, 5796
OFFSET
1,2
COMMENTS
The numerator sequence is A176728.
FORMULA
E.g.f. for rationals A176728/A176729: (1-sqrt(1-x^2))/log(sqrt((1+x)/(1-x))). For n=0 one has a(0)=1, hence A176728(0)/a(0)=0.
EXAMPLE
Rationals A176728/A176729 with offset 0: [0, 1/2, 0, -1/4, 0, -17/6, 0, -1955/24, 0, -44089/10, 0, -4627969/12, ... ].
CROSSREFS
A176726/A176727 a-sequence for triangle A060081.
Sequence in context: A147365 A147064 A147228 * A300509 A074643 A060794
KEYWORD
nonn,easy,frac
AUTHOR
Wolfdieter Lang, Jul 14 2010
STATUS
approved