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A099581 as a simple table

n a(n)
0 0
1 0
2 1
3 3
4 15
5 54
6 216
7 810
8 3105
9 11745
10 44631
11 169128
12 641520
13 2431944
14 9221121
15 34959195
16 132543135
17 502506990
18 1905156936
19 7222991778
20 27384465825
21 103822372809
22 393620574951
23 1492328843280
24 5657848431840
25 21450531825360

[0,0,1,3,15,54,216,810,3105,11745,44631,169128,
 641520,2431944,9221121,34959195,132543135,
 502506990,1905156936,7222991778,27384465825,
 103822372809,393620574951,1492328843280,
 5657848431840,21450531825360]

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Last modified April 18 22:18 EDT 2024. Contains 371782 sequences. (Running on oeis4.)