A178023 Number of permutations of 4 copies of 1..n with no element e[i>=2]<e[1+floor((i-2)/3)] (3-way heap)

1, 12, 807, 167502, 73291308, 74380051365, 168357922807266, 485556480501589584

Offset

1,2

Links

Table of n, a(n) for n=1..8.

Crossrefs

Simple 2-way heap A056971

Sequence in context: A341562 A155813 A220119 * A305935 A228182 A356186

Adjacent sequences: A178020 A178021 A178022 * A178024 A178025 A178026

Keyword

nonn

Author

R. H. Hardin May 17 2010

Status

approved