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A235378 as a simple table

na(n)
1-2
21
3-7
423
5-121
6719
7-5041
840319
9-362881
103628799
11-39916801
12479001599
13-6227020801
1487178291199
15-1307674368001
1620922789887999
17-355687428096001
186402373705727999
19-121645100408832001
202432902008176639999
21-51090942171709440001
221124000727777607679999

[-2,1,-7,23,-121,719,-5041,40319,-362881,3628799,
 -39916801,479001599,-6227020801,87178291199,
 -1307674368001,20922789887999,-355687428096001,
 6402373705727999,-121645100408832001,
 2432902008176639999,-51090942171709440001,
 1124000727777607679999]