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A008521 as a simple table

na(n)
13
25
36
47
58
69
710
811
912
1013
1115
1216
1317
1418
1519
1620
1723
1825
1926
2027
2128
2229
2330
2433
2535
2636
2737
2838
2939
3050
3153
3255
3356
3457
3558
3659
3760
3863
3965
4066
4167
4268
4369
4470
4573
4675
4776
4877
4978
5079
5180
5283
5385
5486
5587
5688
5789
5890
5993
6095
6196
6297
6398
6499
65300
66303
67305
68306
69307

[3,5,6,7,8,9,10,11,12,13,15,16,17,18,19,20,23,25,
 26,27,28,29,30,33,35,36,37,38,39,50,53,55,56,57,
 58,59,60,63,65,66,67,68,69,70,73,75,76,77,78,79,
 80,83,85,86,87,88,89,90,93,95,96,97,98,99,300,303,
 305,306,307]