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A273980 as a simple table

na(n)
18
213
321
426
534
639
747
855
960
1068
1173
1281
1386
1489
1594
16102
17107
18115
19120
20128
21136
22141
23149
24154
25162
26167
27175
28183
29188
30196
31201
32209
33217
34222
35230
36235
37243
38248
39256
40264
41269
42277
43282
44290
45295
46298
47303
48311
49316
50324
51329
52337
53345
54350
55358

[8,13,21,26,34,39,47,55,60,68,73,81,86,89,94,102,
 107,115,120,128,136,141,149,154,162,167,175,183,
 188,196,201,209,217,222,230,235,243,248,256,264,
 269,277,282,290,295,298,303,311,316,324,329,337,
 345,350,358]