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A018840 as a simple table

na(n)
00
15
24
35
42
55
62
75
84
95
104
117
124
135
146
157
166
177
186
197
208
219
228
239
248
259
2610
2711
2810
2911
3010
3111
3212
3313
3412
3513
3612
3713
3814
3915
4014
4115
4214
4315
4416
4517
4616
4717
4816
4917
5018
5119
5218
5319
5418
5519
5620
5721
5820
5921
6020
6121
6222
6323
6422
6523
6622
6723
6824
6925
7024
7125
7224
7325
7426
7527
7626
7727
7826
7927

[0,5,4,5,2,5,2,5,4,5,4,7,4,5,6,7,6,7,6,7,8,9,8,9,
 8,9,10,11,10,11,10,11,12,13,12,13,12,13,14,15,14,
 15,14,15,16,17,16,17,16,17,18,19,18,19,18,19,20,
 21,20,21,20,21,22,23,22,23,22,23,24,25,24,25,24,
 25,26,27,26,27,26,27]