A176728 Numerator of z-sequence for Sheffer triangle A060081.

1, 0, -1, 0, -17, 0, -1955, 0, -44089, 0, -4627969, 0, -10431967727, 0, -424734574531, 0, -187497600357613, 0, -263146180762981877, 0, -77335840394370605087, 0, -38414950218116664660463, 0, -95193934978797641162562791, 0, -1044549307308161782597280065, 0, -836232289988098415162220532417

Offset: 1

Author

Wolfdieter Lang, Jul 14 2010

Keywords

• sign
• easy
• frac

Comments

The denominator sequence is A176729.

For a- and z-sequences for Sheffer triangles see the W. Lang link under A006232.

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)=0.