A176727 Denominator of a-sequence for Sheffer triangle A060081.

1, 1, 3, 1, 15, 1, 21, 1, 45, 1, 33, 1, 1365, 1, 45, 1, 765, 1, 399, 1, 3465, 1, 1035, 1, 20475, 1, 189, 1, 435, 1, 7161, 1, 58905, 1, 315, 1, 959595, 1, 117, 1, 20295, 1, 148995, 1, 108675, 1, 14805, 1, 2436525, 1, 65637, 1, 78705, 1, 21945, 1, 24795, 1, 531, 1, 85180095, 1, 135135

Offset

0,3

Comments

The numerator sequence is A176726.

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

Links

Table of n, a(n) for n=0..62.

W. Lang: Rationals A176726/A176727.

Formula

E.g.f. for rational a-sequence A176726/A176727: x/log(sqrt((1+x)/(1- x))).

Example

Rationals A176726(n)/A176727(n): [1, 0, -2/3, 0, -32/15, 0, -704/21,0,...].

Mathematica

max = 63; s = x/Log[Sqrt[(1+x)/(1-x)]] + O[x]^max; CoefficientList[s, x] * Range[0, max-1]! // Denominator (* Jean-François Alcover, Oct 04 2016 *)

Crossrefs

A176728/A176729 z-sequence for triangle A060081.

Sequence in context: A335265 A141459 A318142 * A080924 A232179 A128042

Adjacent sequences: A176724 A176725 A176726 * A176728 A176729 A176730

Keyword

nonn,easy,frac

Author

Wolfdieter Lang, Jul 14 2010

Status

approved