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A239965 as a simple table

na(n)
11
22
33
44
57
65
76
810
98
1011
119
1212
1315
1413
1514
1618
1721
1816
1920
2017
2122
2225
2323
2419
2524
2628
2726
2829
2927
3030
3133
3231
3332
3443
3534
3637
3735
3836
3940
4044
4138
4245
4339
4446
4549
4647
4741
4848
4952
5050
5142
5251
5353
5456
5554
5660
5755
5857
5964
6058
6159
6274
6362
6465
6561
6663
6771

[1,2,3,4,7,5,6,10,8,11,9,12,15,13,14,18,21,16,20,
 17,22,25,23,19,24,28,26,29,27,30,33,31,32,43,34,
 37,35,36,40,44,38,45,39,46,49,47,41,48,52,50,42,
 51,53,56,54,60,55,57,64,58,59,74,62,65,61,63,71]