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A138020 as a simple table

n a(n)
0 1
1 2
2 6
3 24
4 110
5 544
6 2828
7 15232
8 84246
9 475648
10 2730068
11 15882240
12 93438540
13 554967040
14 3323125528
15 20039827456
16 121597985254
17 741871845376
18 4548193111428
19 28004975116288
20 173113004348580
21 1073893324357632 

[1,2,6,24,110,544,2828,15232,84246,475648,2730068,
 15882240,93438540,554967040,3323125528,
 20039827456,121597985254,741871845376,
 4548193111428,28004975116288,173113004348580,
 1073893324357632]

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Last modified May 6 02:22 EDT 2024. Contains 372290 sequences. (Running on oeis4.)