A228934 - OEIS

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A228934 as a simple table

n	a(n)
1	2
2	4
3	15
4	-99
5	-199
6	-800
7	-79201
8	-316808
9	-12545596801
10	-50182387208
11	-314783998186522867201
12	-1259135992746091468808
13	-198177931028585663493396958369763763148801
14	-792711724114342653973587833479055052595208

[2,4,15,-99,-199,-800,-79201,-316808,-12545596801, -50182387208,-314783998186522867201, -1259135992746091468808, -198177931028585663493396958369763763148801, -792711724114342653973587833479055052595208]