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A012817 as a simple table

na(n)
01
13
25
3-217
42505
5765963
6-6838195
7-9335128657
8286658869905
9407628336475923
10-19130907180121195
11-42164783730598660297
123124552441785986300505
139154657902519091515622683

[1,3,5,-217,2505,765963,-6838195,-9335128657,
 286658869905,407628336475923,-19130907180121195,
 -42164783730598660297,3124552441785986300505,
 9154657902519091515622683]