A206500 - OEIS

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A206500 as a simple table

n	a(n)
1	1
2	4
3	65
4	3130
5	178998
6	10502458
7	618242826
8	36410671102
9	2144479610070
10	126304554589462
11	7439032094765766
12	438141046109721622
13	25805450786659366998
14	1519878816318690262678
15	89517196729004371783830

[1,4,65,3130,178998,10502458,618242826, 36410671102,2144479610070,126304554589462, 7439032094765766,438141046109721622, 25805450786659366998,1519878816318690262678, 89517196729004371783830]