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A015405 as a simple table

na(n)
111
12-1365
133727815
14-6785865905
1514824402656063
16-29439916001972385
1761250446192484546335
18-124468028808034701006945
19255910660218571393553843871
20-523082886040328458081329117025

[1,-1365,3727815,-6785865905,14824402656063,
 -29439916001972385,61250446192484546335,
 -124468028808034701006945,
 255910660218571393553843871,
 -523082886040328458081329117025]