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A336817 as a simple table

na(n)
11
22
35
46
53
64
77
810
98
1011
119
1212
1314
1413
1515
1616
1718
1817
1919
2020
2122
2221
2323
2426
2524
2627
2725
2828
2930
3029
3131
3234
3332
3435
3533
3636
3738
3837
3939
4042
4140
4243
4341
4444
4546
4645
4747
4848
4950
5049
5151
5252
5354
5453
5555
5658
5756
5859
5957
6060
6162
6261
6363
6464
6566
6665
6767

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