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A178023
Number of permutations of 4 copies of 1..n with no element e[i>=2]<e[1+floor((i-2)/3)] (3-way heap).
0
1, 12, 807, 167502, 73291308, 74380051365, 168357922807266, 485556480501589584
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OFFSET
1,2
LINKS
Table of n, a(n) for n=1..8.
CROSSREFS
Simple 2-way heap
A056971
Sequence in context:
A155813
A220119
A393216
*
A305935
A228182
A356186
Adjacent sequences:
A178020
A178021
A178022
*
A178024
A178025
A178026
KEYWORD
nonn
AUTHOR
R. H. Hardin
, May 17 2010
STATUS
approved
