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A140982 as a simple table

na(n)
31
43
51
66
716
81
910
10100
1150
121
1315
14400
15750
16120
171
1821
191225
206125
213675
22245
231
2428
253136
2634300
2754880
2813720
29448
301
3136
327056
33148176
34518616
35345744
3642336
37756
381
3945
4014400
41529200
423556224
435186160
441693440
45113400
461200
471
4855
4927225
501633500

[1,3,1,6,16,1,10,100,50,1,15,400,750,120,1,21,
 1225,6125,3675,245,1,28,3136,34300,54880,13720,
 448,1,36,7056,148176,518616,345744,42336,756,1,45,
 14400,529200,3556224,5186160,1693440,113400,1200,
 1,55,27225,1633500]