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A003308 2*n^(n-2). 1
2, 2, 6, 32, 250, 2592, 33614, 524288, 9565938, 200000000, 4715895382, 123834728448, 3584320788074, 113387824750592, 3892390136718750, 144115188075855872, 5724846103019631586, 242879062193188503552 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

When n >=2, right side of binomial sum n-> sum( i^(n-i-1) * (n-i)^(i-1) *binomial(n, i), i=1..n-1) - Yong Kong (ykong(AT)curagen.com), Dec 28 2000

REFERENCES

A. P. Prudnikov, Yu. A. Brychkov and O.I. Marichev, "Integrals and Series", Volume 1: "Elementary Functions", Chapter 4: "Finite Sums", New York, Gordon and Breach Science Publishers, 1986-1992, Eq. (4.2.2.38)

LINKS

Table of n, a(n) for n=1..18.

CROSSREFS

Equals 2 * A000272.

Sequence in context: A094303 A117394 A267073 * A180069 A032185 A179236

Adjacent sequences:  A003305 A003306 A003307 * A003309 A003310 A003311

KEYWORD

nonn

AUTHOR

Joseph Moser (jmoser(AT)wcupa.edu)

STATUS

approved

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Last modified July 21 02:02 EDT 2019. Contains 325189 sequences. (Running on oeis4.)