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A000427 as a simple table

na(n)
11
28
336
4148
5554
62024
77134
824796
984625
10285784
11953430
123151332
1310314257
1433457972
15107557792
16342732670
171082509680
183389190112
1910518508294
2032361863632

[1,8,36,148,554,2024,7134,24796,84625,285784,
 953430,3151332,10314257,33457972,107557792,
 342732670,1082509680,3389190112,10518508294,
 32361863632]