A078464 - OEIS

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A078464 as a simple table

n	a(n)
1	2
2	6
3	50
4	64130
5	800046
6	137270954
7	1860277042
8	357975249026
9	1036802293087622
10	15013817846943906
11	47192717955016924590
12	10360599532897359064118
13	154361699651715243559786

[2,6,50,64130,800046,137270954,1860277042, 357975249026,1036802293087622,15013817846943906, 47192717955016924590,10360599532897359064118, 154361699651715243559786]