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A018901 as a simple table

n a(n)
0 1
1 1
2 6
3 27
4 146
5 780
6 4332
7 24017
8 135954
9 767394
10 4395456
11 25090131
12 144840476
13 833196442
14 4836766584
15 27981391815
16 163112472594
17 947712321234
18 5542414273884
19 32312202610863
20 189456975899496
21 1107575676600876

[1,1,6,27,146,780,4332,24017,135954,767394,
 4395456,25090131,144840476,833196442,4836766584,
 27981391815,163112472594,947712321234,
 5542414273884,32312202610863,189456975899496,
 1107575676600876]

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Last modified May 14 03:33 EDT 2021. Contains 343872 sequences. (Running on oeis4.)