A032111 - OEIS

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A032111 as a simple table

n	a(n)
1	2
2	6
3	38
4	366
5	4502
6	66606
7	1149878
8	22687566
9	503589782
10	12420052206
11	336947795318
12	9972186170766
13	319727684645462
14	11039636939221806
15	408406422098722358
16	16116066766061589966
17	675700891505466507542

[2,6,38,366,4502,66606,1149878,22687566,503589782, 12420052206,336947795318,9972186170766, 319727684645462,11039636939221806, 408406422098722358,16116066766061589966, 675700891505466507542]