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A022570 as a simple table

na(n)
01
15
215
340
495
5206
6425
7835
81575
92880
105121
118885
1215095
1325165
1441240
1566562
16105945
17166480
18258560
19397235
20604162
21910325
221359680
232014235
242961000
254321283
266263360
279019555
2812908945
2918367805
3025990149
3136581200
3251228175
3371393555
3499037095
35136775685
36188091960

[1,5,15,40,95,206,425,835,1575,2880,5121,8885,
 15095,25165,41240,66562,105945,166480,258560,
 397235,604162,910325,1359680,2014235,2961000,
 4321283,6263360,9019555,12908945,18367805,
 25990149,36581200,51228175,71393555,99037095,
 136775685,188091960]