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A177384 as a simple table

na(n)
01
11
2-2
310
4-72
5644
6-6704
778408
8-1008480
914065744
10-210682080
113365194560
12-57019105920
131020662366400
14-19238635678208
15380825404556288
16-7898501807543808
17171304216873595136
18-3878189367387230720

[1,1,-2,10,-72,644,-6704,78408,-1008480,14065744,
 -210682080,3365194560,-57019105920,1020662366400,
 -19238635678208,380825404556288,-7898501807543808,
 171304216873595136,-3878189367387230720]