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A003994 as a simple table

na(n)
36
4138
51452
611444
778642
8502846
93089624
1018559208
11110049502
12647720562
133796113284
1422194147996
15129581349642
16755982695718
174408534120368
1825702339082192
19149828229039030
20873339353640538
215090437245730652

[6,138,1452,11444,78642,502846,3089624,18559208,
 110049502,647720562,3796113284,22194147996,
 129581349642,755982695718,4408534120368,
 25702339082192,149828229039030,873339353640538,
 5090437245730652]