A093378 - OEIS

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A093378 as a simple table

n	a(n)
1	2
2	12
3	22
4	168
5	1558
6	5148
7	8062
8	177072
9	860882
10	738492
11	121008888
12	298775878
13	1232566932
14	14864798542
15	58374617952

[2,12,22,168,1558,5148,8062,177072,860882,738492, 121008888,298775878,1232566932,14864798542, 58374617952]