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A020983 as a simple table

n a(n)
0 1
1 31
2 643
3 11155
4 174811
5 2566291
6 36012523
7 489103555
8 6481822171
9 84295081651
10 1080159920203
11 13679489505955
12 171612008243131
13 2136467306462611
14 26431716545456683
15 325327578356628355
16 3987253758579873691
17 48696950467661485171
18 593012553894264829963

[1,31,643,11155,174811,2566291,36012523,489103555,
 6481822171,84295081651,1080159920203,
 13679489505955,171612008243131,2136467306462611,
 26431716545456683,325327578356628355,
 3987253758579873691,48696950467661485171,
 593012553894264829963]

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Last modified January 25 07:50 EST 2020. Contains 331241 sequences. (Running on oeis4.)