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A247799 as a simple table

na(n)
00
11
23
35
49
512
618
725
833
937
1047
1158
1263
1376
1490
15105
16121
17138
18144
19163
20183
21204
22226
23249
24273
25280
26306
27333
28361
29390
30420
31451
32483
33491
34525
35560
36596
37605
38643
39682
40722
41763
42805
43848
44892
45937
46983
47993
481041
491090
501140
511191
521243
531296

[0,1,3,5,9,12,18,25,33,37,47,58,63,76,90,105,121,
 138,144,163,183,204,226,249,273,280,306,333,361,
 390,420,451,483,491,525,560,596,605,643,682,722,
 763,805,848,892,937,983,993,1041,1090,1140,1191,
 1243,1296]