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A006557 as a simple table

n a(n)
1 1
2 3
3 23
4 117
5 1609
6 9747
7 184607
8 1257728

[1,3,23,117,1609,9747,184607,1257728]

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Last modified February 19 20:17 EST 2019. Contains 320328 sequences. (Running on oeis4.)