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A201818 as a simple table

na(n)
11
22
34
45
58
69
711
812
915
1016
1117
1218
1319
1422
1526
1629
1730
1833
1934
2038
2139
2241
2343
2445
2550
2651
2752
2854
2955
3057
3160
3267
3372
3473
3574
3678
3779
3885
3986
4087
4189
4292
4393
4495
4596
4697
47100
48103
49107
50108
51109
52110
53111
54115
55121
56123
57125
58131
59134
60136
61137
62141

[1,2,4,5,8,9,11,12,15,16,17,18,19,22,26,29,30,33,
 34,38,39,41,43,45,50,51,52,54,55,57,60,67,72,73,
 74,78,79,85,86,87,89,92,93,95,96,97,100,103,107,
 108,109,110,111,115,121,123,125,131,134,136,137,
 141]