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A304508 as a simple table

na(n)
020
1170
2455
3875
41430
52120
62945
73905
85000
96230
107595
119095
1210730
1312500
1414405
1516445
1618620
1720930
1823375
1925955
2028670
2131520
2234505
2337625
2440880
2544270
2647795
2751455
2855250
2959180
3063245
3167445
3271780
3376250
3480855
3585595
3690470
3795480
38100625
39105905
40111320

[20,170,455,875,1430,2120,2945,3905,5000,6230,
 7595,9095,10730,12500,14405,16445,18620,20930,
 23375,25955,28670,31520,34505,37625,40880,44270,
 47795,51455,55250,59180,63245,67445,71780,76250,
 80855,85595,90470,95480,100625,105905,111320]