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A003268 as a simple table

n a(n)
0 1
1 2
2 6
3 15
4 60
5 260
6 1820
7 12376
8 136136
9 1514513
10 27261234
11 488605194
12 14169550626
13 411591708660
14 19344810307020
15 908637119420910
16 69056421075989160
17 5249543573067466872
18 645693859487298425256
19 79413089729752455762384
20 15803204856220738696714416

[1,2,6,15,60,260,1820,12376,136136,1514513,
 27261234,488605194,14169550626,411591708660,
 19344810307020,908637119420910,69056421075989160,
 5249543573067466872,645693859487298425256,
 79413089729752455762384,
 15803204856220738696714416]

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Last modified March 29 10:59 EDT 2024. Contains 371277 sequences. (Running on oeis4.)