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A143978 as a simple table

na(n)
11
24
38
413
520
628
737
848
960
1073
1188
12104
13121
14140
15160
16181
17204
18228
19253
20280
21308
22337
23368
24400
25433
26468
27504
28541
29580
30620
31661
32704
33748
34793
35840
36888
37937
38988
391040
401093
411148
421204
431261
441320
451380
461441
471504
481568
491633
501700
511768
521837

[1,4,8,13,20,28,37,48,60,73,88,104,121,140,160,
 181,204,228,253,280,308,337,368,400,433,468,504,
 541,580,620,661,704,748,793,840,888,937,988,1040,
 1093,1148,1204,1261,1320,1380,1441,1504,1568,1633,
 1700,1768,1837]