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A249918 as a simple table

na(n)
11
24
37
412
511
68
73
82
99
1014
1113
126
135
1422
1515
1610
1717
1816
1921
2026
2123
2218
2319
2424
2525
2620
2729
2828
2927
3030
3133
3232
3331
3434
3535
3640
3737
3838
3939
4036
4141
4244
4343
4442
4545
4646
4747
4848
4957
5058
5149
5254
5353
5450
5559
5656
5751
5852
5955
6060
6161
6262
6363
6468
6567
6664
6765

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