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A009157 as a simple table

na(n)
01
11
25
313
4-855
5-38791
6-747539
759637061
89421489105
9573991066225
10-49290541346219
11-20481513828195331
12-2616109089676671623
13259051585957836649961
14218489079668015355338557
1545857020942077467007882293
16-6052305324824723639484616287

[1,1,5,13,-855,-38791,-747539,59637061,9421489105,
 573991066225,-49290541346219,-20481513828195331,
 -2616109089676671623,259051585957836649961,
 218489079668015355338557,
 45857020942077467007882293,
 -6052305324824723639484616287]