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A026306 as a simple table

n a(n)
0 0
1 2
2 12
3 69
4 392
5 2235
6 12804
7 73710
8 426192
9 2473704
10 14405800
11 84137130
12 492652824
13 2891110235
14 16999928820
15 100136858625
16 590778928800
17 3490370847876
18 20647839813048
19 122287764072938
20 725023671281520
21 4302720916638417

[0,2,12,69,392,2235,12804,73710,426192,2473704,
 14405800,84137130,492652824,2891110235,
 16999928820,100136858625,590778928800,
 3490370847876,20647839813048,122287764072938,
 725023671281520,4302720916638417]

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Last modified October 25 17:22 EDT 2021. Contains 348255 sequences. (Running on oeis4.)