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A104891 as a simple table

na(n)
00
15
230
3155
4780
53905
619530
797655
8488280
92441405
1012207030
1161035155
12305175780
131525878905
147629394530
1538146972655
16190734863280
17953674316405
184768371582030
1923841857910155
20119209289550780
21596046447753905
222980232238769530
2314901161193847655

[0,5,30,155,780,3905,19530,97655,488280,2441405,
 12207030,61035155,305175780,1525878905,7629394530,
 38146972655,190734863280,953674316405,
 4768371582030,23841857910155,119209289550780,
 596046447753905,2980232238769530,
 14901161193847655]