A147684 Late-growing permutations: number of permutations of 3 indistinguishable copies of 1..n with every partial sum <= the same partial sum averaged over all permutations.

1, 1, 5, 420, 40350, 19369350, 9212531290, 13126885205000, 17810026933803520, 55560479543584645500, 164686892656273830526336, 953018107457232657556038400

Offset

0,3

Links

Table of n, a(n) for n=0..11.

Crossrefs

Cf. A147681.

Column k=3 of A215561.

Sequence in context: A301309 A218406 A217939 * A199090 A218393 A038003

Adjacent sequences: A147681 A147682 A147683 * A147685 A147686 A147687

Keyword

nonn

Author

R. H. Hardin, May 01 2009

Extensions

a(0), a(11) from Alois P. Heinz, Nov 01 2014

Status

approved