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A354399 as a simple table

na(n)
10
21
35
412
521
633
747
864
983
10105
11129
12155
13184
14216
15250
16286
17325
18366
19410
20456
21505
22556
23610
24666
25725
26786
27849
28915
29984
301055
311128
321204
331282
341363
351446
361532
371620
381711
391804
401900
411998
422098
432201
442307
452415
462525
472638
482753
492871
502991
513114
523239
533367
543497
553630
563765
573903
584043
594185
604330
614477
624627
634780
644935

[0,1,5,12,21,33,47,64,83,105,129,155,184,216,250,
 286,325,366,410,456,505,556,610,666,725,786,849,
 915,984,1055,1128,1204,1282,1363,1446,1532,1620,
 1711,1804,1900,1998,2098,2201,2307,2415,2525,2638,
 2753,2871,2991,3114,3239,3367,3497,3630,3765,3903,
 4043,4185,4330,4477,4627,4780,4935]