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A205691 as a simple table

na(n)
15
26
37
47
58
68
79
89
99
1010
1110
1210
1310
1411
1511
1611
1712
1812
1912
2012
2113
2213
2313
2413
2513
2614
2714
2814
2914
3014
3115
3215
3315
3415
3515
3615
3716
3816
3916
4016
4116
4216
4316
4417
4517
4617
4717
4817
4917
5017
5117
5218
5318
5418
5518
5618
5718
5819
5919
6019
6119
6219
6319
6419
6520
6620
6720
6820
6920

[5,6,7,7,8,8,9,9,9,10,10,10,10,11,11,11,12,12,12,
 12,13,13,13,13,13,14,14,14,14,14,15,15,15,15,15,
 15,16,16,16,16,16,16,16,17,17,17,17,17,17,17,17,
 18,18,18,18,18,18,19,19,19,19,19,19,19,20,20,20,
 20,20]