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A006424 as a simple table

na(n)
120
2831
312656
4109075
5648792
62978245
711293436
836973989
9107727724
10285451894
11699013380
121601397330
133465135024
147135903782
1514072047976
1626707904230
1748991682628
1887164772761
19150869282184
20254695011933
21420306632200
22679327313795
231077197343300
241678276223715

[20,831,12656,109075,648792,2978245,11293436,
 36973989,107727724,285451894,699013380,1601397330,
 3465135024,7135903782,14072047976,26707904230,
 48991682628,87164772761,150869282184,254695011933,
 420306632200,679327313795,1077197343300,
 1678276223715]