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A013008 as a simple table

na(n)
01
1-4
280
3-4384
4451328
5-74726784
618162914304
7-6087614197760
82690808196562944
9-1516485688823611392
101061352718471077658624
11-903110171035290053246976
12918161695966849718656434176

[1,-4,80,-4384,451328,-74726784,18162914304,
 -6087614197760,2690808196562944,
 -1516485688823611392,1061352718471077658624,
 -903110171035290053246976,
 918161695966849718656434176]