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A015649 as a simple table

na(n)
20
30
40
50
60
73
86
921
1036
11111
12142
13336
14463
15725
16965
171769
182060
193461
204156
215633
226846
2310371
2411585
2516147
2618924
2723973
2827508
2937822
3040704
3154583
3261865
3374222
3483539
35102970
36110719
37141215
38156763
39182613
40198681

[0,0,0,0,0,3,6,21,36,111,142,336,463,725,965,1769,
 2060,3461,4156,5633,6846,10371,11585,16147,18924,
 23973,27508,37822,40704,54583,61865,74222,83539,
 102970,110719,141215,156763,182613,198681]