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A101927 as a simple table

na(n)
11
2-2
320
4-520
526000
6-2132000
7260104000
8-44217680000
99993195680000
10-2898026747200000
111049085682486400000
12-463695871658988800000
13245758811979264064000000
14-153845016299019304064000000

[1,-2,20,-520,26000,-2132000,260104000,
 -44217680000,9993195680000,-2898026747200000,
 1049085682486400000,-463695871658988800000,
 245758811979264064000000,
 -153845016299019304064000000]