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A067331 as a simple table

na(n)
02
15
212
325
450
596
6180
7331
8600
91075
101908
113360
125878
1310225
1417700
1530509
1652390
1789664
18153000
19260375
20442032
21748775
221265832
232136000
243598250
256052061
2610164540
2717048641
2828559450
2947786400
3079870428
31133359715
32222457608
33370747675
34617363100

[2,5,12,25,50,96,180,331,600,1075,1908,3360,5878,
 10225,17700,30509,52390,89664,153000,260375,
 442032,748775,1265832,2136000,3598250,6052061,
 10164540,17048641,28559450,47786400,79870428,
 133359715,222457608,370747675,617363100]