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A025550 as a simple table

n a(n)
1 1
2 4
3 23
4 176
5 563
6 6508
7 88069
8 91072
9 1593269
10 31037876
11 31730711
12 744355888
13 3788707301
14 11552032628
15 340028535787
16 10686452707072
17 10823198495797
18 10952130239452
19 409741429887649
20 414022624965424
21 17141894231615609

[1,4,23,176,563,6508,88069,91072,1593269,31037876,
 31730711,744355888,3788707301,11552032628,
 340028535787,10686452707072,10823198495797,
 10952130239452,409741429887649,414022624965424,
 17141894231615609]

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Last modified July 25 02:57 EDT 2021. Contains 346282 sequences. (Running on oeis4.)