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A254317 as a simple table

n a(n)
1 1
2 6
3 26
4 102
5 510
6 3210
7 22890
8 153690
9 1507290
10 15618090

[1,6,26,102,510,3210,22890,153690,1507290,
 15618090]

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Last modified July 8 07:34 EDT 2020. Contains 335513 sequences. (Running on oeis4.)