A166355 - OEIS

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A166355 as a simple table

n	a(n)
0	1
1	2
2	5
3	15
4	64
5	443
6	4887
7	78996
8	1745995
9	50333929
10	1829758158
11	81753825477
12	4399497764477
13	280491321580150
14	20898005984605281
15	1798558057748753171
16	177034863818072607020
17	19758697171102806823327

[1,2,5,15,64,443,4887,78996,1745995,50333929, 1829758158,81753825477,4399497764477, 280491321580150,20898005984605281, 1798558057748753171,177034863818072607020, 19758697171102806823327]