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A025595 as a simple table

n a(n)
0 1
1 3
2 18
3 105
4 684
5 4550
6 31340
7 219555
8 1559835
9 11177190
10 80573373
11 583082082
12 4230475092
13 30745373256
14 223692489189
15 1628685532071
16 11863934648190
17 86447927584521
18 630040117048380
19 4592393936655066
20 33477073967039868
21 244050825770095095
22 1779217416632500479

[1,3,18,105,684,4550,31340,219555,1559835,
 11177190,80573373,583082082,4230475092,
 30745373256,223692489189,1628685532071,
 11863934648190,86447927584521,630040117048380,
 4592393936655066,33477073967039868,
 244050825770095095,1779217416632500479]

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Last modified January 18 11:57 EST 2022. Contains 350455 sequences. (Running on oeis4.)