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A337499 as a simple table

n a(n)
0 1
1 2
2 4
3 6
4 14
5 20
6 50
7 70
8 182
9 252
10 672
11 924
12 2508
13 3432
14 9438
15 12870
16 35750
17 48620
18 136136
19 184756
20 520676
21 705432
22 1998724
23 2704156
24 7696444
25 10400600
26 29716000
27 40116600
28 115000920
29 155117520
30 445962870

[1,2,4,6,14,20,50,70,182,252,672,924,2508,3432,
 9438,12870,35750,48620,136136,184756,520676,
 705432,1998724,2704156,7696444,10400600,29716000,
 40116600,115000920,155117520,445962870]

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Last modified February 26 13:59 EST 2021. Contains 341632 sequences. (Running on oeis4.)