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A007227 as a simple table

n a(n)
2 9
3 42
4 236
5 1287
6 7314
7 41990
8 245256
9 1448655
10 8649823
11 52106040
12 316360752
13 1933910820
14 11893566078
15 73537906926
16 456864894288
17 2850557192175
18 17854854154215
19 112230508880490
20 707714010205020
21 4475876883386895

[9,42,236,1287,7314,41990,245256,1448655,8649823,
 52106040,316360752,1933910820,11893566078,
 73537906926,456864894288,2850557192175,
 17854854154215,112230508880490,707714010205020,
 4475876883386895]

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Last modified May 25 12:30 EDT 2019. Contains 323568 sequences. (Running on oeis4.)