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A025197 as a simple table

na(n)
20
30
41
54
68
716
827
943
1064
1192
12128
13172
14227
15294
16373
17467
18576
19703
20849
211015
221203
231414
241652
251916
262209
272533
282890
293282
303710
314177
324684
335234
345829
356470
367161
377903
388698
399549
4010458
4111427
4212458
4313555
4414719
4515953
4617259
4718640
4820098
4921636
5023257

[0,0,1,4,8,16,27,43,64,92,128,172,227,294,373,467,
 576,703,849,1015,1203,1414,1652,1916,2209,2533,
 2890,3282,3710,4177,4684,5234,5829,6470,7161,7903,
 8698,9549,10458,11427,12458,13555,14719,15953,
 17259,18640,20098,21636,23257]