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A007334 as a simple table

na(n)
21
32
48
550
6432
74802
865536
91062882
1020000000
11428717762
1210319560704
13275716983698
148099130339328
15259492675781250
169007199254740992
17336755653118801858
1813493281232954916864
19576882827135242335362
2026214400000000000000000

[1,2,8,50,432,4802,65536,1062882,20000000,
 428717762,10319560704,275716983698,8099130339328,
 259492675781250,9007199254740992,
 336755653118801858,13493281232954916864,
 576882827135242335362,26214400000000000000000]