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A002425 as a simple table

n a(n)
1 1
2 1
3 1
4 17
5 31
6 691
7 5461
8 929569
9 3202291
10 221930581
11 4722116521
12 968383680827
13 14717667114151
14 2093660879252671
15 86125672563201181
16 129848163681107301953
17 868320396104950823611
18 209390615747646519456961

[1,1,1,17,31,691,5461,929569,3202291,221930581,
 4722116521,968383680827,14717667114151,
 2093660879252671,86125672563201181,
 129848163681107301953,868320396104950823611,
 209390615747646519456961]

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Last modified October 23 14:06 EDT 2018. Contains 316528 sequences. (Running on oeis4.)