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A176646 as a simple table

na(n)
10
20
33
421
578
6216
7498
81014
91884
103264
115349
128379
1312642
1418480
1526292
1636540
1749752
1866528
1987543
20113553
21145398
22184008
23230406
24285714
25351156
26428064
27517881
28622167
29742602
30880992
311039272
321219512
331423920
341654848
351914795
362206413
372532510
382896056

[0,0,3,21,78,216,498,1014,1884,3264,5349,8379,
 12642,18480,26292,36540,49752,66528,87543,113553,
 145398,184008,230406,285714,351156,428064,517881,
 622167,742602,880992,1039272,1219512,1423920,
 1654848,1914795,2206413,2532510,2896056]