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A003268 as a simple table

na(n)
01
12
26
315
460
5260
61820
712376
8136136
91514513
1027261234
11488605194
1214169550626
13411591708660
1419344810307020
15908637119420910
1669056421075989160
175249543573067466872
18645693859487298425256
1979413089729752455762384
2015803204856220738696714416

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