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)

1, 25, 3500, 1348025, 1752218300, 5398931034000, 22475921070676500

Offset

1,2

Links

Table of n, a(n) for n=1..7.

Crossrefs

Simple 2-way heap A056971

Sequence in context: A322249 A373878 A185826 * A012748 A337725 A036512

Adjacent sequences: A178023 A178024 A178025 * A178027 A178028 A178029

Keyword

nonn

Author

R. H. Hardin May 17 2010

Status

approved