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A156195 as a simple table

na(n)
01
15
230
3175
41050
56250
637500
7224375
81346250
98068750
1048412500
11290343750
121742062500
1310450312500
1462701875000
15376177734375
162257066406250
1713541839843750
1881251039062500
19487496738281250
202924980429687500
2117549718554687500
22105298311328125000

[1,5,30,175,1050,6250,37500,224375,1346250,
 8068750,48412500,290343750,1742062500,10450312500,
 62701875000,376177734375,2257066406250,
 13541839843750,81251039062500,487496738281250,
 2924980429687500,17549718554687500,
 105298311328125000]