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A178025 Number of permutations of 4 copies of 1..n with no element e[i>=2]<e[1+floor((i-2)/5)] (5-way heap) 0
1, 19, 2265, 1130500, 1023558900, 2110942716750, 8930744592735000 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..7.

CROSSREFS

Simple 2-way heap A056971

Sequence in context: A203704 A087353 A324424 * A172651 A183739 A277000

Adjacent sequences:  A178022 A178023 A178024 * A178026 A178027 A178028

KEYWORD

nonn

AUTHOR

R. H. Hardin May 17 2010

STATUS

approved

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Last modified March 2 19:18 EST 2021. Contains 341756 sequences. (Running on oeis4.)