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A180996 as a simple table

n a(n)
1 2
2 2
3 3
4 7
5 26
6 145
7 1269
8 16666
9 336209
10 10197321
11 469338906
12 32492055785
13 3394528588557
14 533338846061070
15 126158953592584561
16 44869991848754725313
17 24002894812644474337158
18 19303006356138543308410109

[2,2,3,7,26,145,1269,16666,336209,10197321,
 469338906,32492055785,3394528588557,
 533338846061070,126158953592584561,
 44869991848754725313,24002894812644474337158,
 19303006356138543308410109]

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Last modified September 15 22:10 EDT 2019. Contains 327088 sequences. (Running on oeis4.)