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A046990 as a simple table

n a(n)
0 0
1 1
2 1
3 1
4 17
5 31
6 691
7 10922
8 929569
9 3202291
10 221930581
11 9444233042
12 56963745931
13 29435334228302
14 2093660879252671
15 344502690252804724
16 129848163681107301953
17 868320396104950823611
18 209390615747646519456961
19 28259319101491102261334882

[0,1,1,1,17,31,691,10922,929569,3202291,221930581,
 9444233042,56963745931,29435334228302,
 2093660879252671,344502690252804724,
 129848163681107301953,868320396104950823611,
 209390615747646519456961,
 28259319101491102261334882]

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Last modified October 20 22:44 EDT 2019. Contains 328291 sequences. (Running on oeis4.)