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A001931 as a simple table

n a(n)
1 1
2 3
3 15
4 86
5 534
6 3481
7 23502
8 162913
9 1152870
10 8294738
11 60494549
12 446205905
13 3322769321
14 24946773111
15 188625900446
16 1435074454755
17 10977812452428
18 84384157287999
19 651459315795897
20 5049008190434659
21 39269513463794006
22 306405169166373418

[1,3,15,86,534,3481,23502,162913,1152870,8294738,
 60494549,446205905,3322769321,24946773111,
 188625900446,1435074454755,10977812452428,
 84384157287999,651459315795897,5049008190434659,
 39269513463794006,306405169166373418]

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Last modified March 28 20:05 EDT 2024. Contains 371254 sequences. (Running on oeis4.)