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A201953 as a simple table

n a(n)
2 1
3 3
4 15
5 90
6 629
7 5019
8 45030
9 448776
10 4919321
11 58825415
12 762089899
13 10633219662
14 158974192987
15 2535484008225
16 42970371055268
17 771162539117408
18 14609924404202130
19 291386317037291622
20 6102681801481066642
21 133910606028043519500
22 3072216586896101950757

[1,3,15,90,629,5019,45030,448776,4919321,58825415,
 762089899,10633219662,158974192987,2535484008225,
 42970371055268,771162539117408,14609924404202130,
 291386317037291622,6102681801481066642,
 133910606028043519500,3072216586896101950757]

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Last modified November 24 20:34 EST 2020. Contains 338616 sequences. (Running on oeis4.)