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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
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OFFSET
1,2
LINKS
Table of n, a(n) for n=1..7.
CROSSREFS
Simple 2-way heap
A056971
Sequence in context:
A087353
A355982
A324424
*
A364851
A172651
A183739
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 April 23 02:53 EDT 2024. Contains 371906 sequences. (Running on oeis4.)