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)

1, 19, 2265, 1130500, 1023558900, 2110942716750, 8930744592735000

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