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A007808 as a simple table

n a(n)
0 1
1 1
2 3
3 13
4 69
5 431
6 3103
7 25341
8 231689
9 2345851
10 26065011
11 315386633
12 4128697741
13 58145826519
14 876660153671
15 14089181041141
16 240455356435473
17 4343224875615731
18 82776756452911579
19 1660133837750060001
20 34950186057896000021
21 770651602576606800463

[1,1,3,13,69,431,3103,25341,231689,2345851,
 26065011,315386633,4128697741,58145826519,
 876660153671,14089181041141,240455356435473,
 4343224875615731,82776756452911579,
 1660133837750060001,34950186057896000021,
 770651602576606800463]

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Last modified April 12 21:47 EDT 2021. Contains 342933 sequences. (Running on oeis4.)