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A067580 as a simple table

na(n)
21
32
45
57
616
720
864
9140
10304
11352
121104
131248
142640
155568
1622848
1725152
1877760
1984672
20260928
21542592
221126656
231209600
244921344
2510174464
2621012480
2764364544
28197074944
29209018880
30639000576
31674832384
323409993728

[1,2,5,7,16,20,64,140,304,352,1104,1248,2640,5568,
 22848,25152,77760,84672,260928,542592,1126656,
 1209600,4921344,10174464,21012480,64364544,
 197074944,209018880,639000576,674832384,
 3409993728]