A243005 - OEIS

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A243005 as a simple table

n	a(n)
0	2
1	1
2	-1
3	1
4	2
5	-2
6	8
7	40
8	-640
9	54400
10	74854400
11	-8748608000000
12	1406963176644608000000
13	26445277668952736475397120000000000
14	-79938741224658033822711947577298183091491962880000000000

[2,1,-1,1,2,-2,8,40,-640,54400,74854400, -8748608000000,1406963176644608000000, 26445277668952736475397120000000000, -7993874122465803382271194757729818309149196288000\ 0000000]