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A006660 as a simple table

na(n)
31
41
52
63
77
814
936
1081
11221
12538
131530
143926
1511510
1630694
1792114
18252939
19773259
202172830
216743122
2219304190
2360658606
24176343390
25559952824
261649008456
275283239596
2815730575554
2950789908772
30152663683494

[1,1,2,3,7,14,36,81,221,538,1530,3926,11510,30694,
 92114,252939,773259,2172830,6743122,19304190,
 60658606,176343390,559952824,1649008456,
 5283239596,15730575554,50789908772,152663683494]