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A178024 Number of permutations of 4 copies of 1..n with no element e[i>=2]<e[1+floor((i-2)/4)] (4-way heap) 0
1, 16, 1520, 495180, 433646850, 611015783700, 1736467679089500, 9462444875350395600 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..8.

CROSSREFS

Simple 2-way heap A056971

Sequence in context: A302116 A294163 A180504 * A221613 A266156 A054947

Adjacent sequences:  A178021 A178022 A178023 * A178025 A178026 A178027

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.)