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A034860 n!*(2*n-5)/2. 0
3, 36, 300, 2520, 22680, 221760, 2358720, 27216000, 339292800, 4550515200, 65383718400, 1002550348800, 16345929600000, 282457663488000, 5157467707392000, 99236792438784000, 2007144156745728000 (list; graph; refs; listen; history; text; internal format)
OFFSET

3,1

REFERENCES

J. Riordan, Enumeration of trees by height and diameter, IBM J. Res. Dev. 4 (1960), 473-478.

LINKS

Table of n, a(n) for n=3..19.

Index entries for sequences related to factorial numbers

MATHEMATICA

Table[n!*(2*n-5)/2, {n, 3, 20}] (* Harvey P. Dale, Oct 10 2012 *)

CROSSREFS

Sequence in context: A056299 A212616 A073980 * A220831 A003691 A038146

Adjacent sequences:  A034857 A034858 A034859 * A034861 A034862 A034863

KEYWORD

nonn

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified November 27 01:09 EST 2014. Contains 250152 sequences.