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A303672 as a simple table

na(n)
01
1-2
2-8
3-60
4-600
5-7152
6-96456
7-1430544
8-22933920
9-393013280
10-7144207808
11-137001926144
12-2760226854816
13-58242464679360
14-1283886660610560
15-29506641823939200
16-705788634473952000
17-17544801385483584000
18-452659831142363014400

[1,-2,-8,-60,-600,-7152,-96456,-1430544,-22933920,
 -393013280,-7144207808,-137001926144,
 -2760226854816,-58242464679360,-1283886660610560,
 -29506641823939200,-705788634473952000,
 -17544801385483584000,-452659831142363014400]