A009627 - OEIS

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A009627 as a simple table

n	a(n)
0	0
1	2
2	8
3	8
4	-2304
5	-183776
6	-15141248
7	-1461427328
8	-166452797440
9	-21941424508416
10	-3231615038191616
11	-498564870033053696
12	-67544768806700253184
13	-435077810759086759936
14	7017404598452791761076224

[0,2,8,8,-2304,-183776,-15141248,-1461427328, -166452797440,-21941424508416,-3231615038191616, -498564870033053696,-67544768806700253184, -435077810759086759936,7017404598452791761076224]