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A211899 as a simple table

na(n)
10
21
37
428
576
6166
7316
8547
9883
101351
111981
122806
133862
145188
156826
168821
1711221
1814077
1917443
2021376
2125936
2231186
2337192
2444023
2551751
2660451
2770201
2881082
2993178
30106576
31121366
32137641
33155497
34175033
35196351
36219556
37244756
38272062
39301588

[0,1,7,28,76,166,316,547,883,1351,1981,2806,3862,
 5188,6826,8821,11221,14077,17443,21376,25936,
 31186,37192,44023,51751,60451,70201,81082,93178,
 106576,121366,137641,155497,175033,196351,219556,
 244756,272062,301588]