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A113001 as a simple table

na(n)
11
23
32
44
55
66
79
87
912
108
1111
1210
1314
1413
1515
1619
1718
1817
1916
2020
2124
2222
2321
2426
2525
2623
2728
2827
2930
3032
3131
3237
3329
3439
3536
3633
3735
3842
3934
4045
4138
4240
4344
4443
4541
4648
4747
4852
4951
5049
5146
5253
5354
5455
5558
5657
5756
5860
5964
6050
6163
6262
6361
6459
6566
6665
6771
6870
6969
7067
7172
7268

[1,3,2,4,5,6,9,7,12,8,11,10,14,13,15,19,18,17,16,
 20,24,22,21,26,25,23,28,27,30,32,31,37,29,39,36,
 33,35,42,34,45,38,40,44,43,41,48,47,52,51,49,46,
 53,54,55,58,57,56,60,64,50,63,62,61,59,66,65,71,
 70,69,67,72,68]