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A049683 as a simple table

n a(n)
0 0
1 1
2 20
3 361
4 6480
5 116281
6 2086580
7 37442161
8 671872320
9 12056259601
10 216340800500
11 3882078149401
12 69661065888720
13 1250017107847561
14 22430646875367380
15 402501626648765281
16 7222598632802407680
17 129604273763794572961
18 2325654329115499905620

[0,1,20,361,6480,116281,2086580,37442161,
 671872320,12056259601,216340800500,3882078149401,
 69661065888720,1250017107847561,22430646875367380,
 402501626648765281,7222598632802407680,
 129604273763794572961,2325654329115499905620]

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Last modified June 25 12:55 EDT 2019. Contains 324352 sequences. (Running on oeis4.)