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A291580 as a simple table

na(n)
11
22
33
44
55
66
77
88
99
1010
1111
1212
1313
1414
1515
168
1716
189
1916
2010
2114
2211
2316
248
2516
2613
279
2814
2916
3010
3116
328
3311
3416
3514
369
3716
3816
3913
408
4116
4214
4316
4411
459
4616
4716
488
4914
5010
5116
5213
5316
549
5511
568
5716
5816
5916
6010
6116
6216
639
648
6513
6611
6716
6816
6916
7010

[1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,8,16,9,16,10,
 14,11,16,8,16,13,9,14,16,10,16,8,11,16,14,9,16,16,
 13,8,16,14,16,11,9,16,16,8,14,10,16,13,16,9,11,8,
 16,16,16,10,16,16,9,8,13,11,16,16,16,10]