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A000492 as a simple table

na(n)
620
7154
81676
914292
10155690
111731708
1221264624
13280260864
143970116255
1560113625680
16969368687752
1716588175089420
18300272980075896
195733025551810600
20115148956467702600
212427199940533198992
2253576182138937428377
231235917889588345408586

[20,154,1676,14292,155690,1731708,21264624,
 280260864,3970116255,60113625680,969368687752,
 16588175089420,300272980075896,5733025551810600,
 115148956467702600,2427199940533198992,
 53576182138937428377,1235917889588345408586]