A147713 Late-growing permutations: number of permutations of 15 indistinguishable copies of 1..n with every partial sum <= the same partial sum averaged over all permutations.
1, 9694845, 3343436236585914480, 64804916367088484487100154177496, 161780768091373089273770663805075564895813872000
Offset: 1