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A007820 as a simple table

n a(n)
0 1
1 1
2 7
3 90
4 1701
5 42525
6 1323652
7 49329280
8 2141764053
9 106175395755
10 5917584964655
11 366282500870286
12 24930204590758260
13 1850568574253550060
14 148782988064375309400
15 12879868072770626040000
16 1194461517469807833782085
17 118144018577011378596484455

[1,1,7,90,1701,42525,1323652,49329280,2141764053,
 106175395755,5917584964655,366282500870286,
 24930204590758260,1850568574253550060,
 148782988064375309400,12879868072770626040000,
 1194461517469807833782085,
 118144018577011378596484455]

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Last modified July 21 02:02 EDT 2019. Contains 325189 sequences. (Running on oeis4.)