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A325850 as a simple table

n a(n)
0 1
1 1
2 2
3 4
4 18
5 72
6 446
7 2804
8 21560
9 184364
10 1788514

[1,1,2,4,18,72,446,2804,21560,184364,1788514]

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Last modified April 9 09:59 EDT 2020. Contains 333348 sequences. (Running on oeis4.)