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A003486 as a simple table

n a(n)
0 1
1 6
2 45
3 270
4 1377
5 6318
6 26973
7 109350
8 426465
9 1614006
10 5963949
11 21611934
12 77058945
13 271034910
14 942244893
15 3242852982
16 11063007297
17 37450647270
18 125911658925
19 420738651054
20 1398200544801
21 4623476115726

[1,6,45,270,1377,6318,26973,109350,426465,1614006,
 5963949,21611934,77058945,271034910,942244893,
 3242852982,11063007297,37450647270,125911658925,
 420738651054,1398200544801,4623476115726]

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Last modified August 6 18:52 EDT 2020. Contains 336256 sequences. (Running on oeis4.)