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A195760 as a simple table

na(n)
01
15
215
335
470
5130
6230
7390
8635
9995
101515
112255
123290
134710
146620
159160
1612505
1716865
1822485
1929645
2038695
2150055
2264215
2381735
24103245
25129505
26161405
27199965
28246335
29301795
30367855
31446255
32538965
33648185
34776345
35926265
361101155
371304615
381540635

[1,5,15,35,70,130,230,390,635,995,1515,2255,3290,
 4710,6620,9160,12505,16865,22485,29645,38695,
 50055,64215,81735,103245,129505,161405,199965,
 246335,301795,367855,446255,538965,648185,776345,
 926265,1101155,1304615,1540635]