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A105337 as a simple table

na(n)
00
11
23
36
410
515
621
728
836
945
1055
1166
1278
1391
14105
15120
16136
17153
18171
19190
20210
21231
22253
2320
2444
2569
2695
27122
28150
29179
30209
31240
3216
3349
3483
35118
36154
37191
38229
3912
4052
4193
42135
43178
44222
4511
4657
47104
48152
49201
50251
5146
5298
53151
54205
554
5660
57117
58175
59234
6038
6199

[0,1,3,6,10,15,21,28,36,45,55,66,78,91,105,120,
 136,153,171,190,210,231,253,20,44,69,95,122,150,
 179,209,240,16,49,83,118,154,191,229,12,52,93,135,
 178,222,11,57,104,152,201,251,46,98,151,205,4,60,
 117,175,234,38,99]