A178020 - OEIS

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A178020

Number of permutations of 3 copies of 1..n with no element e[i>=2]<e[1+floor((i-2)/5)] (5-way heap)

1, 10, 200, 13440, 2097900, 442030200, 257134170000, 122150707608000, 111415794466080000, 163780469919918720000 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`1,2`
	LINKS	`Table of n, a(n) for n=1..10.`
	CROSSREFS	`Simple 2-way heap A056971` `Sequence in context: A156275 A036362 A051262 * A041183 A210168 A041180` `Adjacent sequences: A178017 A178018 A178019 * A178021 A178022 A178023`
	KEYWORD	`nonn`
	AUTHOR	`R. H. Hardin May 17 2010`
	STATUS	`approved`

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Last modified May 21 20:53 EDT 2013. Contains 225504 sequences.