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A188315 as a simple table

na(n)
01
11
2-4
3-129
4-3689
5-113689
67001471
77911171596
86480598259201
95987117709349201
10-4830209396684261199
11-230318343950087449971199
12-5423908604123397486016003604
13-147547506573676549005535542233729
14739578212227710098047348234126634311

[1,1,-4,-129,-3689,-113689,7001471,7911171596,
 6480598259201,5987117709349201,
 -4830209396684261199,-230318343950087449971199,
 -5423908604123397486016003604,
 -147547506573676549005535542233729,
 739578212227710098047348234126634311]