A037586 - OEIS

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A037586 as a simple table

n	a(n)
1	3
2	22
3	157
4	1100
5	7703
6	53922
7	377457
8	2642200
9	18495403
10	129467822
11	906274757
12	6343923300
13	44407463103
14	310852241722
15	2175965692057
16	15231759844400
17	106622318910803
18	746356232375622
19	5224493626629357

[3,22,157,1100,7703,53922,377457,2642200,18495403, 129467822,906274757,6343923300,44407463103, 310852241722,2175965692057,15231759844400, 106622318910803,746356232375622,5224493626629357]