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A000344 as a simple table

n a(n)
2 1
3 5
4 20
5 75
6 275
7 1001
8 3640
9 13260
10 48450
11 177650
12 653752
13 2414425
14 8947575
15 33266625
16 124062000
17 463991880
18 1739969550
19 6541168950
20 24647883000
21 93078189750
22 352207870014
23 1335293573130
24 5071418015120
25 19293438101000
26 73514652074500
27 280531912316292

[1,5,20,75,275,1001,3640,13260,48450,177650,
 653752,2414425,8947575,33266625,124062000,
 463991880,1739969550,6541168950,24647883000,
 93078189750,352207870014,1335293573130,
 5071418015120,19293438101000,73514652074500,
 280531912316292]

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Last modified January 18 20:57 EST 2019. Contains 319282 sequences. (Running on oeis4.)