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A087030 as a simple table

na(n)
13
24
37
46
59
68
715
814
913
1012
1115
1214
1321
1420
1519
1618
1721
1820
1927
2026
2125
2224
2335
2434
2533
2632
2731
2830
2933
3032
3143
3242
3341
3440
3539
3638
3745
3844
3943
4042
4145
4244
4351
4450
4549
4648
4759
4858
4957
5056
5155
5254
5365
5464
5563
5662
5761
5860
5963
6062
6173
6272
6371
6470
6569
6668
6775
6874
6973
7072
7175

[3,4,7,6,9,8,15,14,13,12,15,14,21,20,19,18,21,20,
 27,26,25,24,35,34,33,32,31,30,33,32,43,42,41,40,
 39,38,45,44,43,42,45,44,51,50,49,48,59,58,57,56,
 55,54,65,64,63,62,61,60,63,62,73,72,71,70,69,68,
 75,74,73,72,75]