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A354750 as a simple table

na(n)
01
11
2-1
36
4-48
5534
6-7542
7129240
8-2603736
960292512
10-1577546928
1146021512096
12-1480976147664
1352110720451152
14-1990258155061776
1581995762243700864
16-3624527727510038784
17171109526616468957312
18-8591991935936929932672
19457246520477143117555968

[1,1,-1,6,-48,534,-7542,129240,-2603736,60292512,
 -1577546928,46021512096,-1480976147664,
 52110720451152,-1990258155061776,
 81995762243700864,-3624527727510038784,
 171109526616468957312,-8591991935936929932672,
 457246520477143117555968]