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A099452 as a simple table

na(n)
01
15
216
340
479
5110
623
7-520
8-2336
9-6995
10-16574
11-31075
12-38848
139560
14258631
151043950
162978719
176781640
1812060848
1913119125
20-12022526
21-124662155
22-461573264
23-1259138680
24-2752822273
25-4615067410
26-4134056729
278360350360
2858685747584
29202130368445
30528415922498

[1,5,16,40,79,110,23,-520,-2336,-6995,-16574,
 -31075,-38848,9560,258631,1043950,2978719,6781640,
 12060848,13119125,-12022526,-124662155,-461573264,
 -1259138680,-2752822273,-4615067410,-4134056729,
 8360350360,58685747584,202130368445,528415922498]