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A375253 as a simple table

na(n)
01
15
230
3140
4630
52646
610710
741910
8159885
9597025
102190188
117914270
1228230020
1399567300
14347720040
151203777072
164135047615
1714105322315
1847813634330
19161154659820
20540353553894
211803226621350
225991410183850
2319827295283250
2465371101643575

[1,5,30,140,630,2646,10710,41910,159885,597025,
 2190188,7914270,28230020,99567300,347720040,
 1203777072,4135047615,14105322315,47813634330,
 161154659820,540353553894,1803226621350,
 5991410183850,19827295283250,65371101643575]