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A006860 as a simple table

n a(n)
1 1
2 3
3 13
4 111
5 1381
6 25623
7 678133
8 26269735
9 1447451707
10 114973020921
11 13034306495563

[1,3,13,111,1381,25623,678133,26269735,1447451707,
 114973020921,13034306495563]

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Last modified February 19 22:38 EST 2019. Contains 320328 sequences. (Running on oeis4.)