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A012599 as a simple table

na(n)
02
1-32
2-4608
3129331200
410853318000640
51726305357602488320
6538535159720462065336320
7306551574237383273309735485440

[2,-32,-4608,129331200,10853318000640,
 1726305357602488320,538535159720462065336320,
 306551574237383273309735485440]