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A025570 as a simple table

n a(n)
1 1
2 2
3 8
4 40
5 211
6 1148
7 6369
8 35816
9 203424
10 1164228
11 6703372
12 38785840
13 225325940
14 1313494396
15 7679038865
16 45006411960
17 264357297375
18 1555762562100
19 9171399730944
20 54148782940112
21 320136500713070
22 1895036382245032
23 11230166960501463
24 66619011999761208
25 395563260817743219

[1,2,8,40,211,1148,6369,35816,203424,1164228,
 6703372,38785840,225325940,1313494396,7679038865,
 45006411960,264357297375,1555762562100,
 9171399730944,54148782940112,320136500713070,
 1895036382245032,11230166960501463,
 66619011999761208,395563260817743219]

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Last modified January 29 16:58 EST 2020. Contains 331347 sequences. (Running on oeis4.)