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A018983 as a simple table

n a(n)
2 2
3 6
4 35
5 160
6 1026
7 6251
8 39860
9 258021
10 1710770
11 11553916
12 78929862
13 546477542
14 3822747838
15 26980876665
16 191958821704

[2,6,35,160,1026,6251,39860,258021,1710770,
 11553916,78929862,546477542,3822747838,
 26980876665,191958821704]

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Last modified December 13 03:41 EST 2019. Contains 329968 sequences. (Running on oeis4.)