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A020026 as a simple table

n a(n)
0 1
1 1
2 1
3 3
4 10
5 45
6 251
7 1666
8 12701
9 109544
10 1054364
11 11202617
12 130230419
13 1644159040
14 22401666926
15 327624378798
16 5119130918712
17 85105551523595
18 1499985345603354
19 27937227061862467
20 548268081089050918

[1,1,1,3,10,45,251,1666,12701,109544,1054364,
 11202617,130230419,1644159040,22401666926,
 327624378798,5119130918712,85105551523595,
 1499985345603354,27937227061862467,
 548268081089050918]

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Last modified June 14 09:06 EDT 2021. Contains 345018 sequences. (Running on oeis4.)