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A266540 as a simple table

na(n)
10
20
31
42
53
64
77
810
911
1012
1115
1218
1323
1428
1535
1642
1743
1844
1947
2050
2155
2260
2367
2474
2583
2692
27103
28114
29127
30140
31155
32170
33171
34172
35175
36178
37183
38188
39195
40202
41211
42220
43231
44242
45255
46268
47283
48298
49315
50332
51351
52370
53391
54412
55435
56458
57483
58508
59535
60562
61591
62620
63651
64682
65683
66684
67687
68690
69695
70700

[0,0,1,2,3,4,7,10,11,12,15,18,23,28,35,42,43,44,
 47,50,55,60,67,74,83,92,103,114,127,140,155,170,
 171,172,175,178,183,188,195,202,211,220,231,242,
 255,268,283,298,315,332,351,370,391,412,435,458,
 483,508,535,562,591,620,651,682,683,684,687,690,
 695,700]