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A000268 as a simple table

na(n)
11
23
315
4105
5947
610472
7137337
82085605
936017472
10697407850
1114969626900
12352877606716
139064191508018
14252024567201300
157542036496650006
16241721880399970938
178261159383595659128
18299916384730043070880
1911526945327529620432872
20467583770376898192016104

[1,3,15,105,947,10472,137337,2085605,36017472,
 697407850,14969626900,352877606716,9064191508018,
 252024567201300,7542036496650006,
 241721880399970938,8261159383595659128,
 299916384730043070880,11526945327529620432872,
 467583770376898192016104]