A000825 - OEIS

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A000825 as a simple table

n	a(n)
0	1
1	1
2	3
3	8
4	57
5	256
6	2763
7	17408
8	250737
9	2031616
10	36581523
11	362283008
12	7828053417
13	91620376576
14	2309644635483
15	31191159799808
16	898621108880097
17	13753735117275136
18	445777636063460643
19	7625476699018231808

[1,1,3,8,57,256,2763,17408,250737,2031616, 36581523,362283008,7828053417,91620376576, 2309644635483,31191159799808,898621108880097, 13753735117275136,445777636063460643, 7625476699018231808]