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A135916 as a simple table

na(n)
10
20
315
475
5222
6510
71005
81785
92940
104572
116795
129735
1313530
1418330
1524297
1631605
1740440
1851000
1963495
2078147
2195190
22114870
23137445
24163185
25192372
26225300
27262275
28303615
29349650
30400722
31457185
32519405
33587760
34662640
35744447
36833595
37930510

[0,0,15,75,222,510,1005,1785,2940,4572,6795,9735,
 13530,18330,24297,31605,40440,51000,63495,78147,
 95190,114870,137445,163185,192372,225300,262275,
 303615,349650,400722,457185,519405,587760,662640,
 744447,833595,930510]