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A081306 as a simple table

na(n)
11
22
33
44
55
66
77
88
99
1011
1112
1213
1315
1416
1517
1618
1719
1823
1924
2025
2127
2229
2331
2432
2535
2636
2737
2841
2943
3045
3147
3248
3349
3453
3554
3659
3761
3864
3967
4071
4172
4273
4375
4477
4579
4681
4783
4889
4991
5096
5197
52101
53103
54107
55108
56109
57113
58121
59125
60127
61128
62131
63135
64137
65139
66143
67144

[1,2,3,4,5,6,7,8,9,11,12,13,15,16,17,18,19,23,24,
 25,27,29,31,32,35,36,37,41,43,45,47,48,49,53,54,
 59,61,64,67,71,72,73,75,77,79,81,83,89,91,96,97,
 101,103,107,108,109,113,121,125,127,128,131,135,
 137,139,143,144]