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A099450 as a simple table

na(n)
01
15
218
355
4149
5360
6757
71265
81026
9-3725
10-25807
11-102960
12-334151
13-950035
14-2411118
15-5405345
16-10148899
17-12907080
186506893
19122884025
20568871874
211984171195
225938752857
2315804565920
2437451559601
2576625836565
26120968265618
2768460472135
28-504475498651

[1,5,18,55,149,360,757,1265,1026,-3725,-25807,
 -102960,-334151,-950035,-2411118,-5405345,
 -10148899,-12907080,6506893,122884025,568871874,
 1984171195,5938752857,15804565920,37451559601,
 76625836565,120968265618,68460472135,
 -504475498651]