A121425 - OEIS

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A121425 as a simple table

n	a(n)
0	1
1	2
2	12
3	118
4	1605
5	27816
6	585046
7	14459138
8	410368743
9	13146830110
10	469123986529
11	18447791712945
12	792514583941223
13	36925394368325295
14	1854525584914459755
15	99872579714406393286
16	5740977285851988017769

[1,2,12,118,1605,27816,585046,14459138,410368743, 13146830110,469123986529,18447791712945, 792514583941223,36925394368325295, 1854525584914459755,99872579714406393286, 5740977285851988017769]