A178020 Number of permutations of 3 copies of 1..n with no element e[i>=2]<e[1+floor((i-2)/5)] (5-way heap).

1, 10, 200, 13440, 2097900, 442030200, 257134170000, 122150707608000, 111415794466080000, 163780469919918720000

Offset

1,2

Links

Table of n, a(n) for n=1..10.

Crossrefs

Simple 2-way heap A056971.

Sequence in context: A051262 A367201 A362723 * A279833 A041183 A210168

Adjacent sequences: A178017 A178018 A178019 * A178021 A178022 A178023

Keyword

nonn

Author

R. H. Hardin, May 17 2010

Status

approved