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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
OFFSET
1,2
CROSSREFS
Simple 2-way heap A056971
Sequence in context: A087353 A355982 A324424 * A364851 A172651 A183739
KEYWORD
nonn
AUTHOR
R. H. Hardin May 17 2010
STATUS
approved