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A212978 as a simple table

na(n)
01
15
211
320
432
546
663
783
8105
9130
10158
11188
12221
13257
14295
15336
16380
17426
18475
19527
20581
21638
22698
23760
24825
25893
26963
271036
281112
291190
301271
311355
321441
331530
341622
351716
361813
371913
382015
392120
402228
412338
422451
432567
442685
452806
462930

[1,5,11,20,32,46,63,83,105,130,158,188,221,257,
 295,336,380,426,475,527,581,638,698,760,825,893,
 963,1036,1112,1190,1271,1355,1441,1530,1622,1716,
 1813,1913,2015,2120,2228,2338,2451,2567,2685,2806,
 2930]