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A008981 as a simple table

n a(n)
0 1
1 2
2 5
3 21
4 102
5 639
6 4492
7 34032
8 272252
9 2267905
10 19502386
11 172111844
12 1551948268

[1,2,5,21,102,639,4492,34032,272252,2267905,
 19502386,172111844,1551948268]

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Last modified July 12 10:20 EDT 2020. Contains 335657 sequences. (Running on oeis4.)