A248795 - OEIS

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A248795 as a simple table

n	a(n)
1	1
2	3
3	5
4	15
5	255
6	65535
7	2200694
8	2619705
9	6372794
10	40588485
11	76466985
12	81591194
13	118018094
14	206569605
15	470542485
16	525644385
17	726638834
18	791937614
19	971122514
20	991172805

[1,3,5,15,255,65535,2200694,2619705,6372794, 40588485,76466985,81591194,118018094,206569605, 470542485,525644385,726638834,791937614,971122514, 991172805]