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A206980 as a simple table

n a(n)
1 2
2 16
3 58
4 556
5 7500
6 119224
7 2926752
8 111202694
9 5582239354
10 398193149976
11 43178426815216
12 6623459579619334
13 1414003622686654366
14 443957184641073369216

[2,16,58,556,7500,119224,2926752,111202694,
 5582239354,398193149976,43178426815216,
 6623459579619334,1414003622686654366,
 443957184641073369216]

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Last modified January 26 13:13 EST 2021. Contains 340439 sequences. (Running on oeis4.)