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A178026 Number of permutations of 4 copies of 1..n with no element e[i>=2]<e[1+floor((i-2)/6)] (6-way heap) 0
1, 25, 3500, 1348025, 1752218300, 5398931034000, 22475921070676500 (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: A203186 A322249 A185826 * A012748 A337725 A036512

Adjacent sequences:  A178023 A178024 A178025 * A178027 A178028 A178029

KEYWORD

nonn

AUTHOR

R. H. Hardin May 17 2010

STATUS

approved

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Last modified February 25 19:39 EST 2021. Contains 341618 sequences. (Running on oeis4.)