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A006418 as a simple table

na(n)
21
338
4469
53008
612843
742602
8119042
9293578
10658021
111367170
122670203
134953136
148794967
1515040494
1624893192
1740031954
1862755945
1996162286
20144361777
21212738384
22308258755
23439838594
24618773310
25859240970
261178886221
271599494506
282147766583
292856204064

[1,38,469,3008,12843,42602,119042,293578,658021,
 1367170,2670203,4953136,8794967,15040494,24893192,
 40031954,62755945,96162286,144361777,212738384,
 308258755,439838594,618773310,859240970,
 1178886221,1599494506,2147766583,2856204064]