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A269533 as a simple table

na(n)
15
225
3120
4568
52648
612214
755836
8253418
91143256
105131592
1122934652
12102124670
13453300160
142006497722
158860136576
1639040820448
17171705037456
18753921273870
193305432501828
2014473039186090
2163296720868120
22276532411704016

[5,25,120,568,2648,12214,55836,253418,1143256,
 5131592,22934652,102124670,453300160,2006497722,
 8860136576,39040820448,171705037456,753921273870,
 3305432501828,14473039186090,63296720868120,
 276532411704016]