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A375420 as a simple table

na(n)
10
21
33
44
58
613
717
820
925
1032
1140
1248
1356
1466
1574
1684
1794
18105
19120
20135
21148
22162
23176
24191
25211
26230
27247
28267
29287
30306
31333
32361
33385
34410
35437
36462
37488
38517
39545
40571
41601
42633
43663
44696
45730
46761
47796
48836
49879
50921
51962
521000
531038
541080
551122

[0,1,3,4,8,13,17,20,25,32,40,48,56,66,74,84,94,
 105,120,135,148,162,176,191,211,230,247,267,287,
 306,333,361,385,410,437,462,488,517,545,571,601,
 633,663,696,730,761,796,836,879,921,962,1000,1038,
 1080,1122]