A009559 - OEIS

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A009559 as a simple table

n	a(n)
0	1
1	-4
2	-4
3	104
4	5392
5	167936
6	1592384
7	-401669248
8	-50456008448
9	-2742470413312
10	310319594802176
11	116183782320392192
12	12985923007223566336
13	-3777809306960427778048
14	-2961060938622580774715392

[1,-4,-4,104,5392,167936,1592384,-401669248, -50456008448,-2742470413312,310319594802176, 116183782320392192,12985923007223566336, -3777809306960427778048, -2961060938622580774715392]