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A087806 as a simple table

n a(n)
0 1
1 0
2 3
3 15
4 117
5 998
6 9335
7 93054
8 974085
9 10596336
10 118903599
11 1368808785
12 16099107057
13 192831403950
14 2346213458667
15 28938983482353
16 361243476790605
17 4557409523980664
18 58041112443611015
19 745468216328206179
20 9647990383169438001
21 125732717320525253430

[1,0,3,15,117,998,9335,93054,974085,10596336,
 118903599,1368808785,16099107057,192831403950,
 2346213458667,28938983482353,361243476790605,
 4557409523980664,58041112443611015,
 745468216328206179,9647990383169438001,
 125732717320525253430]

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Last modified February 5 09:25 EST 2023. Contains 360084 sequences. (Running on oeis4.)