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A025747 as a simple table

na(n)
01
13
26
310
415
521
628
736
845
955
1066
1178
1291
13105
14120
15136
16153
17171
18190
19210
20231
21254
22278
23303
24329
25356
26384
27413
28443
29474
30506
31539
32573
33608
34644
35681
36719
37758
38798
39839
40881
41924
42969
431015
441062
451110
461159
471209
481260
491312
501365
511419
521474
531530
541587

[1,3,6,10,15,21,28,36,45,55,66,78,91,105,120,136,
 153,171,190,210,231,254,278,303,329,356,384,413,
 443,474,506,539,573,608,644,681,719,758,798,839,
 881,924,969,1015,1062,1110,1159,1209,1260,1312,
 1365,1419,1474,1530,1587]