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A137557 as a simple table

n a(n)
1 1
2 2
3 5
4 14
5 43
6 150
7 617
8 3050
9 18059
10 125930
11 1013553
12 9246862
13 94226123
14 1059882190
15 13035332841

[1,2,5,14,43,150,617,3050,18059,125930,1013553,
 9246862,94226123,1059882190,13035332841]

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Last modified August 17 17:59 EDT 2022. Contains 356189 sequences. (Running on oeis4.)