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A375999 as a simple table

na(n)
11
23
36
410
515
620
721
828
936
1045
1150
1255
1366
1478
1591
16105
17120
18136
19153
20171
21175
22190
23196
24210
25231
26253
27276
28300
29325
30336
31351
32378
33406
34435
35465
36490
37496
38528
39540
40561
41595
42630
43666
44703
45741
46780
47820
48825
49861
50903
51946
52990
531035
541081
551128

[1,3,6,10,15,20,21,28,36,45,50,55,66,78,91,105,
 120,136,153,171,175,190,196,210,231,253,276,300,
 325,336,351,378,406,435,465,490,496,528,540,561,
 595,630,666,703,741,780,820,825,861,903,946,990,
 1035,1081,1128]