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A056499 as a simple table

na(n)
10
20
30
43
56
621
736
890
9150
10339
11540
121149
131806
143765
155790
1611880
1718150
1836894
1955980
20113145
21170970
22344541
23519156
241043190
251569744
263149979
274733670
289488409
2914250606
3028544205
3142850116
3285786560
33128746410
34257672355
35386634018
36773623116
371160688606

[0,0,0,3,6,21,36,90,150,339,540,1149,1806,3765,
 5790,11880,18150,36894,55980,113145,170970,344541,
 519156,1043190,1569744,3149979,4733670,9488409,
 14250606,28544205,42850116,85786560,128746410,
 257672355,386634018,773623116,1160688606]