A209459 - OEIS

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A209459 as a simple table

n	a(n)
1	2
2	6
3	57
4	700
5	10676
6	192994
7	3966581
8	89157292
9	2122477292
10	52308803176
11	1315354516436
12	33456562887760
13	856485703088336
14	22005434702222368
15	566526069249475088
16	14601678389694957760
17	376583948372941600448

[2,6,57,700,10676,192994,3966581,89157292, 2122477292,52308803176,1315354516436, 33456562887760,856485703088336,22005434702222368, 566526069249475088,14601678389694957760, 376583948372941600448]