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A189238 as a simple table

n a(n)
1 1
2 2
3 6
4 28
5 120
6 726
7 4424
8 31928
9 249984
10 2131690
11 20027392
12 199240020
13 2162269824
14 24676708798
15 302660939520
16 3897794538864
17 53264941301760
18 763279034957010
19 11499327153704960
20 181271619624350860

[1,2,6,28,120,726,4424,31928,249984,2131690,
 20027392,199240020,2162269824,24676708798,
 302660939520,3897794538864,53264941301760,
 763279034957010,11499327153704960,
 181271619624350860]

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Last modified May 23 16:39 EDT 2022. Contains 353977 sequences. (Running on oeis4.)