A032030 - OEIS

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A032030 as a simple table

n	a(n)
1	2
2	2
3	8
4	46
5	276
6	1836
7	12712
8	90610
9	661652
10	4922404
11	37178736
12	284330552
13	2197474456
14	17136206984
15	134667604360
16	1065457242054
17	8479671583004
18	67841927540372
19	545314544677904
20	4401667141277988

[2,2,8,46,276,1836,12712,90610,661652,4922404, 37178736,284330552,2197474456,17136206984, 134667604360,1065457242054,8479671583004, 67841927540372,545314544677904,4401667141277988]