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A268291 as a simple table

na(n)
00
11
23
36
410
515
621
728
836
945
1055
1166
1278
1378
1479
1581
1684
1788
1893
1999
20106
21114
22123
23133
24144
25156
26156
27157
28159
29162
30166
31171
32177
33184
34192
35201
36211
37222
38234
39234
40235
41237
42240
43244
44249
45255
46262
47270
48279
49289
50300
51312
52312
53313
54315
55318
56322
57327
58333
59340
60348

[0,1,3,6,10,15,21,28,36,45,55,66,78,78,79,81,84,
 88,93,99,106,114,123,133,144,156,156,157,159,162,
 166,171,177,184,192,201,211,222,234,234,235,237,
 240,244,249,255,262,270,279,289,300,312,312,313,
 315,318,322,327,333,340,348]