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A249966 as a simple table

n a(n)
1 15
2 4999
3 267004
4 5207128
5 55191061
6 389769865
7 2062131616
8 8794967112
9 31750272891
10 100377252987
11 284840809660
12 738995422048
13 1777772706385
14 4009552754989
15 8552986503328
16 17379265831600
17 33835476742695

[15,4999,267004,5207128,55191061,389769865,
 2062131616,8794967112,31750272891,100377252987,
 284840809660,738995422048,1777772706385,
 4009552754989,8552986503328,17379265831600,
 33835476742695]

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Last modified October 16 08:50 EDT 2021. Contains 348041 sequences. (Running on oeis4.)