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A296200 as a simple table

na(n)
21
35
421
547
6104
7182
8318
9490
10755
111075
121531
132065
142786
153612
164684
175892
187413
199105
2011185
2113475
2216236
2319250
2422826
2526702
2631239
2736127
2841783
2947845
3054790
3162200
3270616
3379560
3489641
35100317
36112269
37124887
38138928
39153710
40170070
41187250

[1,5,21,47,104,182,318,490,755,1075,1531,2065,
 2786,3612,4684,5892,7413,9105,11185,13475,16236,
 19250,22826,26702,31239,36127,41783,47845,54790,
 62200,70616,79560,89641,100317,112269,124887,
 138928,153710,170070,187250]