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A003517 as a simple table

n a(n)
2 1
3 6
4 27
5 110
6 429
7 1638
8 6188
9 23256
10 87210
11 326876
12 1225785
13 4601610
14 17298645
15 65132550
16 245642760
17 927983760
18 3511574910
19 13309856820
20 50528160150
21 192113383644
22 731508653106
23 2789279908316
24 10649977831752
25 40715807302800

[1,6,27,110,429,1638,6188,23256,87210,326876,
 1225785,4601610,17298645,65132550,245642760,
 927983760,3511574910,13309856820,50528160150,
 192113383644,731508653106,2789279908316,
 10649977831752,40715807302800]

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Last modified October 22 06:02 EDT 2018. Contains 316432 sequences. (Running on oeis4.)