A009553 - OEIS

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A009553 as a simple table

n	a(n)
0	1
1	2
2	-4
3	-176
4	-1712
5	66912
6	4737344
7	53926656
8	-18559434496
9	-1869838374400
10	35429689535488
11	36301265658269696
12	4137398544580202496
13	-569857298193726644224
14	-297369786811582548131840

[1,2,-4,-176,-1712,66912,4737344,53926656, -18559434496,-1869838374400,35429689535488, 36301265658269696,4137398544580202496, -569857298193726644224,-297369786811582548131840]