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A056374 as a simple table

na(n)
15
225
375
4375
5825
68125
713175
8103125
9327125
102445625
114884435
1261640625
13101732425
141017323125
153816215625
1619104609375
1747683838325
18635787765625
191059638680675
2011924780390625
2139736963221875
22238418603522125
23541860418146375

[5,25,75,375,825,8125,13175,103125,327125,2445625,
 4884435,61640625,101732425,1017323125,3816215625,
 19104609375,47683838325,635787765625,
 1059638680675,11924780390625,39736963221875,
 238418603522125,541860418146375]