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A077366 as a simple table

na(n)
10
21
33
46
510
615
721
828
936
1045
1155
1266
1378
1491
15105
16136
17210
18231
19300
20406
21435
22465
23561
24630
25666
26703
27861
28903
291035
302016
312211
322556
333003
343916
354005
365151
376105
386216
396555
406786
418001
428911
439453
4410011
4510153
4619900
4720100
4820910
4923005

[0,1,3,6,10,15,21,28,36,45,55,66,78,91,105,136,
 210,231,300,406,435,465,561,630,666,703,861,903,
 1035,2016,2211,2556,3003,3916,4005,5151,6105,6216,
 6555,6786,8001,8911,9453,10011,10153,19900,20100,
 20910,23005]