A037100 - OEIS

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A037100 as a simple table

n	a(n)
1	4
2	6
3	12
4	24
5	54
6	186
7	3246
8	25926
9	169314
10	412026
11	541524
12	37949286
13	124716066
14	324532464
15	26678398374
16	3559613215806
17	30751771983294
18	20116294396883346

[4,6,12,24,54,186,3246,25926,169314,412026,541524, 37949286,124716066,324532464,26678398374, 3559613215806,30751771983294,20116294396883346]