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A000264 as a simple table

na(n)
11
21
33
414
580
6518
73647
827274
9213480
101731652
1114455408
12123552488
131077096124
149548805240
1585884971043
16782242251522
177203683481720
1866989439309452
19628399635777936
205940930064989720
2156562734108608536

[1,1,3,14,80,518,3647,27274,213480,1731652,
 14455408,123552488,1077096124,9548805240,
 85884971043,782242251522,7203683481720,
 66989439309452,628399635777936,5940930064989720,
 56562734108608536]