A293561 Column 3 of A142249.

3, 19, 80, 286, 945, 2997, 9294, 28456, 86471, 261559, 788892, 2375010, 7141581, 21457705, 64438874, 193447948, 580606275, 1742343435, 5228079240, 15686335270, 47063200553, 141197990749, 423610749990, 1270865804976, 3812664524415, 11438127791647

Offset: 3

Author

Vaclav Kotesovec, Oct 12 2017

Keywords

• nonn

Links

• Vaclav Kotesovec, Table of n, a(n) for n = 3..300

Crossrefs

Cf. A142249.

Programs

Mathematica

Table[(CoefficientList[Simplify[(1-x)^n * PolyLog[-n, 2, x] / (x*Log[1-x])], x]/.x->1-E)[[3]], {n, 4, 20}]

Formula

a(n) ~ 3^n / 2.