A166199 - OEIS

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A166199 as a simple table

n	a(n)
0	1
1	5
2	2
3	4
4	25
5	64
6	249
7	2376
8	9030
9	76249
10	1598732
11	10091912
12	165533393
13	6511049130
14	90909213960
15	2908246084285
16	219536965840260
17	5801006454694383

[1,5,2,4,25,64,249,2376,9030,76249,1598732, 10091912,165533393,6511049130,90909213960, 2908246084285,219536965840260,5801006454694383]