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A025748 as a simple table

n a(n)
0 1
1 1
2 3
3 15
4 90
5 594
6 4158
7 30294
8 227205
9 1741905
10 13586859
11 107459703
12 859677624
13 6943550040
14 56540336040
15 463630755528
16 3824953733106
17 31724616256938
18 264371802141150
19 2212374554760150
20 18583946259985260

[1,1,3,15,90,594,4158,30294,227205,1741905,
 13586859,107459703,859677624,6943550040,
 56540336040,463630755528,3824953733106,
 31724616256938,264371802141150,2212374554760150,
 18583946259985260]

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Last modified July 9 16:24 EDT 2020. Contains 335544 sequences. (Running on oeis4.)