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A031168 as a simple table

na(n)
115
216
318
422
520
624
724
824
924
1024
1128
1224
1326
1428
1526
1626
1724
1828
1930
2030
2130
2228
2326
2424
2530
2630
2734
2832
2940
3038
3130
3232
3330
3434
3530
3630
3734
3830
3930
4026
4132
4242
4336
4436
4536
4640
4730
4828
4930
5034
5136
5232
5336
5430
5526
5630
5738
5840
5936
6036
6148
6244
6340
6438
6540
6642
6736

[15,16,18,22,20,24,24,24,24,24,28,24,26,28,26,26,
 24,28,30,30,30,28,26,24,30,30,34,32,40,38,30,32,
 30,34,30,30,34,30,30,26,32,42,36,36,36,40,30,28,
 30,34,36,32,36,30,26,30,38,40,36,36,48,44,40,38,
 40,42,36]