A012782 - OEIS

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A012782 as a simple table

n	a(n)
0	1
1	1
2	1
3	5
4	17
5	85
6	505
7	3201
8	25153
9	204905
10	1945265
11	19581949
12	217998673
13	2608398013
14	33522871785
15	463598293497
16	6789373095937
17	106484041306577
18	1755926841763681
19	30821112722260469
20	566210591513987345

[1,1,1,5,17,85,505,3201,25153,204905,1945265, 19581949,217998673,2608398013,33522871785, 463598293497,6789373095937,106484041306577, 1755926841763681,30821112722260469, 566210591513987345]