A030894 - OEIS

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A030894 as a simple table

n	a(n)
1	1
2	2
3	8
4	34
5	170
6	1024
7	7173
8	57385
9	516468
10	5164680
11	56811482
12	681737791
13	8862591291
14	124076278077
15	1861144171155
16	29778306738485
17	506231214554248
18	9112161861976473
19	173131075377552995
20	3462621507551059902

[1,2,8,34,170,1024,7173,57385,516468,5164680, 56811482,681737791,8862591291,124076278077, 1861144171155,29778306738485,506231214554248, 9112161861976473,173131075377552995, 3462621507551059902]