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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
OFFSET
1,2
CROSSREFS
Simple 2-way heap A056971
Sequence in context: A322249 A373878 A185826 * A012748 A337725 A036512
KEYWORD
nonn
AUTHOR
R. H. Hardin May 17 2010
STATUS
approved