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A090020 as a simple table

n a(n)
0 0
1 1
2 13
3 91
4 529
5 2851
6 14833
7 75811
8 383809
9 1932931
10 9705553
11 48648931
12 243605089
13 1219100611
14 6098716273
15 30503196451
16 152544778369
17 762810181891
18 3814309582993
19 19072323542371
20 95363943807649
21 476826695752771

[0,1,13,91,529,2851,14833,75811,383809,1932931,
 9705553,48648931,243605089,1219100611,6098716273,
 30503196451,152544778369,762810181891,
 3814309582993,19072323542371,95363943807649,
 476826695752771]

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Last modified July 24 21:47 EDT 2021. Contains 346273 sequences. (Running on oeis4.)