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A129207 as a simple table

na(n)
01
11
2-49
3-4799
44728001
518618840001
6-767067390499249
7-54213419267800732799
8250137278774864229623059201
9-1127677799839642474480271473583999
10-195577262542844878506138849501555847171249

[1,1,-49,-4799,4728001,18618840001,
 -767067390499249,-54213419267800732799,
 250137278774864229623059201,
 -1127677799839642474480271473583999,
 -195577262542844878506138849501555847171249]