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A012640 as a simple table

na(n)
01
1-5
273
3-3565
4337873
5-53181845
612563583641
7-4158179320061
81836546568939681
9-1043609929405146661
10741652625178569817577
11-644417189348695489885965
12672084091294680203529876081

[1,-5,73,-3565,337873,-53181845,12563583641,
 -4158179320061,1836546568939681,
 -1043609929405146661,741652625178569817577,
 -644417189348695489885965,
 672084091294680203529876081]