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A257059 as a simple table

n a(n)
1 1
2 4
3 18
4 81
5 1024
6 7353
7 106056
8 1249592
9 22143847
10 282475249
11 8589934592
12 133642251792
13 3531308221901
14 71789886480657
15 2171807721018968
16 45949729863572161
17 2218611106740436992
18 53241469411989452625

[1,4,18,81,1024,7353,106056,1249592,22143847,
 282475249,8589934592,133642251792,3531308221901,
 71789886480657,2171807721018968,45949729863572161,
 2218611106740436992,53241469411989452625]

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Last modified January 19 21:47 EST 2020. Contains 331066 sequences. (Running on oeis4.)