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

Author

Wolfdieter Lang, Jul 14 2010

Keywords

• nonn
• easy
• frac

Comments

The numerator sequence is A176728.

Examples

			Rationals A176728/A176729 with offset 0: [0, 1/2, 0, -1/4, 0, -17/6, 0, -1955/24, 0, -44089/10, 0, -4627969/12, ... ].
		

Links

• W. Lang: Rationals A176728/A176729.

Crossrefs

A176726/A176727 a-sequence for triangle A060081.

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.