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A059302 as a simple table

na(n)
2-1
3-1
45
525
670
7154
8294
9510
10825
111265
121859
132639
143640
154900
166460
178364
1810659
1913395
2016625
2120405
2224794
2329854
2435650
2542250
2649725
2758149
2867599
2978155
3089900
31102920
32117304
33133144
34150535
35169575
36190365
37213009
38237614
39264290
40293150
41324310
42357889
43394009
44432795
45474375

[-1,-1,5,25,70,154,294,510,825,1265,1859,2639,
 3640,4900,6460,8364,10659,13395,16625,20405,24794,
 29854,35650,42250,49725,58149,67599,78155,89900,
 102920,117304,133144,150535,169575,190365,213009,
 237614,264290,293150,324310,357889,394009,432795,
 474375]