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A281590 as a simple table

na(n)
11
24
39
415
520
627
733
841
948
1056
1164
1272
1380
1489
1598
16107
17116
18126
19136
20146
21156
22166
23176
24187
25198
26208
27219
28231
29242
30253
31265
32276
33288
34300
35312
36324
37337
38349
39362
40374
41387
42400
43413
44426
45439
46452
47465
48479
49492
50506
51519
52533
53547
54561
55575

[1,4,9,15,20,27,33,41,48,56,64,72,80,89,98,107,
 116,126,136,146,156,166,176,187,198,208,219,231,
 242,253,265,276,288,300,312,324,337,349,362,374,
 387,400,413,426,439,452,465,479,492,506,519,533,
 547,561,575]