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A199903 as a simple table

na(n)
11
24
312
424
582
6232
7654
82044
96096
1018564
1157500
12177032
13550098
141715956
155359158
1616799508
1752760640
18165976252
19523094304
201650781728
215216112586
2216501009804
2352252555938
24165618780196
25525388548976
261667965025692

[1,4,12,24,82,232,654,2044,6096,18564,57500,
 177032,550098,1715956,5359158,16799508,52760640,
 165976252,523094304,1650781728,5216112586,
 16501009804,52252555938,165618780196,525388548976,
 1667965025692]