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A002815 as a simple table

na(n)
00
11
23
36
49
513
617
722
827
932
1037
1143
1249
1356
1463
1570
1677
1785
1893
19102
20111
21120
22129
23139
24149
25159
26169
27179
28189
29200
30211
31223
32235
33247
34259
35271
36283
37296
38309
39322
40335
41349
42363
43378
44393
45408
46423
47439
48455
49471

[0,1,3,6,9,13,17,22,27,32,37,43,49,56,63,70,77,85,
 93,102,111,120,129,139,149,159,169,179,189,200,
 211,223,235,247,259,271,283,296,309,322,335,349,
 363,378,393,408,423,439,455,471]