A176729 Denominator of z-sequence for Sheffer triangle A060081.

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.

Links

Table of n, a(n) for n=1..68.

W. Lang: Rationals A176728/A176729.

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

Adjacent sequences: A176726 A176727 A176728 * A176730 A176731 A176732

Keyword

nonn,easy,frac

Author

Wolfdieter Lang, Jul 14 2010

Status

approved