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A269463 as a simple table

na(n)
15
225
3120
4580
52780
613300
763420
8301780
91433180
106795700
1132180220
12152216980
13719335580
143396714100
1516028713020
1675595396180
17356358069980
181679206088500
197909957661820
2037249421039380
21175371521796380
22825484323238900

[5,25,120,580,2780,13300,63420,301780,1433180,
 6795700,32180220,152216980,719335580,3396714100,
 16028713020,75595396180,356358069980,
 1679206088500,7909957661820,37249421039380,
 175371521796380,825484323238900]