A011809 - OEIS

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A011809 as a simple table

n	a(n)
0	2
1	14
2	378
3	30772
4	6807620
5	3763991016
6	4811471951354
7	13277799809473332
8	74561538032148504662
9	809821626491578170933334
10	16284904611381210096496935806
11	583857656205952477141180365415562

[2,14,378,30772,6807620,3763991016,4811471951354, 13277799809473332,74561538032148504662, 809821626491578170933334, 16284904611381210096496935806, 583857656205952477141180365415562]