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A037123 as a simple table

na(n)
00
11
23
36
410
515
621
728
836
945
1046
1148
1251
1355
1460
1566
1673
1781
1890
19100
20102
21105
22109
23114
24120
25127
26135
27144
28154
29165
30168
31172
32177
33183
34190
35198
36207
37217
38228
39240
40244
41249
42255
43262
44270
45279
46289
47300
48312
49325
50330
51336
52343
53351
54360
55370
56381

[0,1,3,6,10,15,21,28,36,45,46,48,51,55,60,66,73,
 81,90,100,102,105,109,114,120,127,135,144,154,165,
 168,172,177,183,190,198,207,217,228,240,244,249,
 255,262,270,279,289,300,312,325,330,336,343,351,
 360,370,381]