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A076521 as a simple table

na(n)
20
31
42
54
66
77
89
911
1013
1115
1218
1320
1422
1524
1627
1729
1832
1934
2037
2139
2242
2345
2447
2550
2653
2756
2859
2961
3064
3167
3270
3373
3476
3579
3682
3785
3888
3991
4094
4197
42100
43104
44107
45110
46113
47116
48120
49123
50126
51129
52133
53136
54139
55142
56146
57149
58152
59156
60159
61163
62166
63169
64173
65176
66180

[0,1,2,4,6,7,9,11,13,15,18,20,22,24,27,29,32,34,
 37,39,42,45,47,50,53,56,59,61,64,67,70,73,76,79,
 82,85,88,91,94,97,100,104,107,110,113,116,120,123,
 126,129,133,136,139,142,146,149,152,156,159,163,
 166,169,173,176,180]