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A064347 as a simple table

n a(n)
0 1
1 1
2 18
3 1701
4 278478
5 56542698
6 12838905972
7 3121895416077
8 795077021525526
9 209364566760439038
10 56540432581528153788
11 15573764062988183490786
12 4358381303784085630372620
13 1235729432868053981694246324

[1,1,18,1701,278478,56542698,12838905972,
 3121895416077,795077021525526,209364566760439038,
 56540432581528153788,15573764062988183490786,
 4358381303784085630372620,
 1235729432868053981694246324]

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Last modified July 17 20:45 EDT 2019. Contains 325109 sequences. (Running on oeis4.)