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A000984 as a simple table

n a(n)
0 1
1 2
2 6
3 20
4 70
5 252
6 924
7 3432
8 12870
9 48620
10 184756
11 705432
12 2704156
13 10400600
14 40116600
15 155117520
16 601080390
17 2333606220
18 9075135300
19 35345263800
20 137846528820
21 538257874440
22 2104098963720
23 8233430727600
24 32247603683100
25 126410606437752
26 495918532948104
27 1946939425648112

[1,2,6,20,70,252,924,3432,12870,48620,184756,
 705432,2704156,10400600,40116600,155117520,
 601080390,2333606220,9075135300,35345263800,
 137846528820,538257874440,2104098963720,
 8233430727600,32247603683100,126410606437752,
 495918532948104,1946939425648112]

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Last modified June 21 19:00 EDT 2018. Contains 305630 sequences. (Running on oeis4.)