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Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.

A012223 as a simple table

na(n)
01
1-3
249
3-2139
4181921
5-25347539
65231635473
7-1498270773419
8568381637171521
9-275844413823596835
10166680279670474243825
11-122705715387723016322939
12108112687783657068510670305

[1,-3,49,-2139,181921,-25347539,5231635473,
 -1498270773419,568381637171521,
 -275844413823596835,166680279670474243825,
 -122705715387723016322939,
 108112687783657068510670305]