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A084576 as a simple table

na(n)
11
23
36
411
518
624
734
845
956
1068
1183
1298
13117
14135
15157
16175
17201
18223
19250
20275
21304
22335
23365
24397
25432
26469
27504
28540
29583
30620
31666
32709
33754
34801
35847
36898
37946
38998
391055
401103

[1,3,6,11,18,24,34,45,56,68,83,98,117,135,157,175,
 201,223,250,275,304,335,365,397,432,469,504,540,
 583,620,666,709,754,801,847,898,946,998,1055,1103]