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A167018 as a simple table

n a(n)
0 1
1 1
2 4
3 20
4 149
5 1491
6 18612
7 275856
8 4699180
9 89993827
10 1907644760
11 44253266889
12 1113845999245
13 30214252304871
14 878483783958444
15 27252652393849400
16 898540310823301994
17 31378570076570865074
18 1157108876622296079054

[1,1,4,20,149,1491,18612,275856,4699180,89993827,
 1907644760,44253266889,1113845999245,
 30214252304871,878483783958444,27252652393849400,
 898540310823301994,31378570076570865074,
 1157108876622296079054]

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Last modified June 18 13:40 EDT 2024. Contains 373481 sequences. (Running on oeis4.)