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A156926 as a simple table

na(n)
01
12
2-8
3-96
44608
51105920
6-1592524800
7-16052649984000
81294485694709760000
9939485937792555417600000
10-6818413142123250198773760000000
11-544338467423010707068824846336000000000
12521477993674340011006196823029396275200000000000

[1,2,-8,-96,4608,1105920,-1592524800,
 -16052649984000,1294485694709760000,
 939485937792555417600000,
 -6818413142123250198773760000000,
 -544338467423010707068824846336000000000,
 521477993674340011006196823029396275200000000000]