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A132985 as a simple table

na(n)
01
15
215
340
495
5205
6420
7820
81535
92785
104915
118460
1214260
1323590
1438360
1561440
1697055
17151370
18233355
19355900
20537395
21803960
221192380
231754140
242560980
253712205
265344570
277645600
2810871080
2915368350
3021607220
3130220360
3242056415
3358249680
3480310510

[1,5,15,40,95,205,420,820,1535,2785,4915,8460,
 14260,23590,38360,61440,97055,151370,233355,
 355900,537395,803960,1192380,1754140,2560980,
 3712205,5344570,7645600,10871080,15368350,
 21607220,30220360,42056415,58249680,80310510]