A151640 - OEIS

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A151640

Number of permutations of 4 indistinguishable copies of 1..n with exactly 2 adjacent element pairs in decreasing order.

0, 36, 1828, 40136, 693960, 11000300, 168594156, 2550000528 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,2`
	CROSSREFS	`Sequence in context: A190918 A113618 A054980 * A025754 A071128 A065782` `Adjacent sequences: A151637 A151638 A151639 * A151641 A151642 A151643`
	KEYWORD	`nonn`
	AUTHOR	`R. H. Hardin (rhhardin(AT)att.net) May 29 2009`

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Last modified February 14 01:35 EST 2012. Contains 205567 sequences.