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A201720 The total number of components in (A011800) of all labeled forests on n nodes whose components are all paths. 0
0, 1, 3, 12, 64, 420, 3246, 28798, 288072, 3205044, 39234340, 523821936, 7572221328, 117792884872, 1961516974704, 34807390821960, 655594811020096, 13060711726818768, 274358217793164912, 6060159633360214144, 140404595387426964480 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..20.

MATHEMATICA

D[Range[0, 20]! CoefficientList[ Series[Exp[y (2 x - x^2)/(2 - 2 x)], {x, 0, 20}], x], y] /. y -> 1

CROSSREFS

Cf. A011800.

Sequence in context: A308204 A307724 A029851 * A207557 A235129 A222033

Adjacent sequences:  A201717 A201718 A201719 * A201721 A201722 A201723

KEYWORD

nonn

AUTHOR

Geoffrey Critzer, Dec 04 2011

STATUS

approved

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Last modified May 29 04:33 EDT 2020. Contains 334697 sequences. (Running on oeis4.)