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A001921 as a simple table

na(n)
00
17
2104
31455
420272
5282359
63932760
754776287
8762935264
910626317415
10148005508552
112061450802319
1228712305723920
13399910829332567
145570039304932024
1577580639439715775
161080558912851088832
1715050244140475527879
18209622859053806301480

[0,7,104,1455,20272,282359,3932760,54776287,
 762935264,10626317415,148005508552,2061450802319,
 28712305723920,399910829332567,5570039304932024,
 77580639439715775,1080558912851088832,
 15050244140475527879,209622859053806301480]