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A363510 as a simple table

na(n)
01
15
215
350
4190
5766
63231
714066
862681
9284591
101311622
116120183
1228855529
13137257541
14657894518
153174411715
1615406640415
1775162477018
18368383443235
191813007892858
208956214966017
2144393932344984
22220732441125743
231100621484436502

[1,5,15,50,190,766,3231,14066,62681,284591,
 1311622,6120183,28855529,137257541,657894518,
 3174411715,15406640415,75162477018,368383443235,
 1813007892858,8956214966017,44393932344984,
 220732441125743,1100621484436502]