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A002720 as a simple table

na(n)
01
12
27
334
4209
51546
613327
7130922
81441729
917572114
10234662231
113405357682
1253334454417
13896324308634
1416083557845279
15306827170866106
166199668952527617
17132240988644215842
182968971263911288999
1969974827707903049154
201727194482044146637521
2144552237162692939114282

[1,2,7,34,209,1546,13327,130922,1441729,17572114,
 234662231,3405357682,53334454417,896324308634,
 16083557845279,306827170866106,6199668952527617,
 132240988644215842,2968971263911288999,
 69974827707903049154,1727194482044146637521,
 44552237162692939114282]