A007129 - OEIS

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A007129 as a simple table

n	a(n)
1	0
2	2
3	12
4	176
5	6416
6	745920
7	293075904
8	394099077120
9	1835009281314048
10	30009926711011488256
11	1747146367164504269618176
12	366331755173237226238282129408
13	279347803170668467265962662338908160

[0,2,12,176,6416,745920,293075904,394099077120, 1835009281314048,30009926711011488256, 1747146367164504269618176, 366331755173237226238282129408, 279347803170668467265962662338908160]