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A269431 as a simple table

na(n)
15
225
3125
4615
52995
614455
769235
8329430
91558430
107334806
1134364270
12160340610
13745362730
143453222850
1515949215754
1673454841775
17337413819915
181546145183895
197068979186035
2032251365241137
21146853223312325
22667445619383425

[5,25,125,615,2995,14455,69235,329430,1558430,
 7334806,34364270,160340610,745362730,3453222850,
 15949215754,73454841775,337413819915,
 1546145183895,7068979186035,32251365241137,
 146853223312325,667445619383425]