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A120131 as a simple table

na(n)
15
26
38
413
513
615
715
817
917
1017
1120
1220
1321
1421
1524
1625
1725
1825
1926
2026
2128
2229
2329
2430
2530
2630
2735
2835
2936
3037
3137
3237
3337
3437
3539
3639
3739
3839
3940
4040
4140
4241
4341
4441
4541
4642
4744
4844
4945
5048
5148
5250
5350
5451
5551
5651
5751
5852
5952
6052
6152
6252
6352
6453
6553
6653
6753
6855
6955
7056

[5,6,8,13,13,15,15,17,17,17,20,20,21,21,24,25,25,
 25,26,26,28,29,29,30,30,30,35,35,36,37,37,37,37,
 37,39,39,39,39,40,40,40,41,41,41,41,42,44,44,45,
 48,48,50,50,51,51,51,51,52,52,52,52,52,52,53,53,
 53,53,55,55,56]