A037642 - OEIS

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A037642 as a simple table

n	a(n)
1	2
2	17
3	120
4	842
5	5897
6	41280
7	288962
8	2022737
9	14159160
10	99114122
11	693798857
12	4856592000
13	33996144002
14	237973008017
15	1665811056120
16	11660677392842
17	81624741749897
18	571373192249280
19	3999612345744962

[2,17,120,842,5897,41280,288962,2022737,14159160, 99114122,693798857,4856592000,33996144002, 237973008017,1665811056120,11660677392842, 81624741749897,571373192249280,3999612345744962]