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A109772 as a simple table

na(n)
01
12
232
3-448
4258
582432
6-1067584
7-5811456
8340793856
9-2998521854
10-51094125376
111517473732032
12-6428001477632
13-345000533911040
146658043297901184
158307326726656256
16-2094184270312728574
1727053603162176532480
18250115549146474154720
19-11797456310343541979456

[1,2,32,-448,258,82432,-1067584,-5811456,
 340793856,-2998521854,-51094125376,1517473732032,
 -6428001477632,-345000533911040,6658043297901184,
 8307326726656256,-2094184270312728574,
 27053603162176532480,250115549146474154720,
 -11797456310343541979456]