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A056742 as a simple table

na(n)
21
33
44
515
618
763
864
9216
10300
11968
12864
134095
145292
1513500
1616384
1765535
1869984
19262143
20240000
21889056
221320352
234105040
243317760
2516200000
2622358700
2756733696
2866382848
29266913216
30267300000
311073741823
321073741824

[1,3,4,15,18,63,64,216,300,968,864,4095,5292,
 13500,16384,65535,69984,262143,240000,889056,
 1320352,4105040,3317760,16200000,22358700,
 56733696,66382848,266913216,267300000,1073741823,
 1073741824]