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A015561 as a simple table

n a(n)
0 0
1 1
2 7
3 53
4 399
5 3005
6 22631
7 170437
8 1283583
9 9666829
10 72802135
11 548282261
12 4129184367
13 31097419613
14 234198674759
15 1763780401765
16 13283257511391
17 100037924186797
18 753398499353143
19 5673941192219189
20 42731182342946895

[0,1,7,53,399,3005,22631,170437,1283583,9666829,
 72802135,548282261,4129184367,31097419613,
 234198674759,1763780401765,13283257511391,
 100037924186797,753398499353143,5673941192219189,
 42731182342946895]

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Last modified November 20 14:54 EST 2019. Contains 329337 sequences. (Running on oeis4.)