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A199904 as a simple table

na(n)
11
24
324
472
5256
61312
75206
821208
997668
10422052
111819620
128158144
1336110122
14159422584
15712790438
163182921756
1714206099012
1863688577860
19285783359204
201282956672032
215770687400200
2225983122754016
23117074268243396

[1,4,24,72,256,1312,5206,21208,97668,422052,
 1819620,8158144,36110122,159422584,712790438,
 3182921756,14206099012,63688577860,285783359204,
 1282956672032,5770687400200,25983122754016,
 117074268243396]