A024489 - OEIS

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A024489

a(n) = (1/(9n-3))*M(3n; n,n,n), where M() is a multinomial coefficient.

1, 6, 70, 1050, 18018, 336336, 6651216, 137181330, 2921454250, 63804560820, 1422156202740, 32235540595440 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,2`
	CROSSREFS	`Sequence in context: A104900 A186667 A001448 * A036361 A050788 A027317` `Adjacent sequences: A024486 A024487 A024488 * A024490 A024491 A024492`
	KEYWORD	`nonn`
	AUTHOR	`Clark Kimberling (ck6(AT)evansville.edu)`

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Last modified February 14 23:04 EST 2012. Contains 205686 sequences.