A208051 - OEIS

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A208051 as a simple table

n	a(n)
1	2
2	15
3	716
4	83440
5	18171918
6	6423127757
7	3376465219485
8	2486327138729353
9	2454996141671330713
10	3143641561804718358884
11	5084413934903476204054959
12	10166624612435356414640715276
13	24691194409056203926713355839051

[2,15,716,83440,18171918,6423127757,3376465219485, 2486327138729353,2454996141671330713, 3143641561804718358884,5084413934903476204054959, 10166624612435356414640715276, 24691194409056203926713355839051]