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A187608 as a simple table

na(n)
10
20
30
428
5144
6340
7675
81120
91675
102340
113115
124000
134995
146100
157315
168640
1710075
1811620
1913275
2015040
2116915
2218900
2320995
2423200
2525515
2627940
2730475
2833120
2935875
3038740
3141715
3244800
3347995
3451300
3554715
3658240
3761875
3865620
3969475
4073440
4177515

[0,0,0,28,144,340,675,1120,1675,2340,3115,4000,
 4995,6100,7315,8640,10075,11620,13275,15040,16915,
 18900,20995,23200,25515,27940,30475,33120,35875,
 38740,41715,44800,47995,51300,54715,58240,61875,
 65620,69475,73440,77515]