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A005521 as a simple table

na(n)
01
12
24
37
412
518
626
735
846
960
1075
1193
12113
13134
14157
15183
16212
17242
18275
19310
20346
21385
22426
23470
24518
25568
26619
27672
28726
29782
30845
31910
32978
331047
341121
351196
361274
371355
381438
391524
401613
411703
421798

[1,2,4,7,12,18,26,35,46,60,75,93,113,134,157,183,
 212,242,275,310,346,385,426,470,518,568,619,672,
 726,782,845,910,978,1047,1121,1196,1274,1355,1438,
 1524,1613,1703,1798]