A293031 - OEIS

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A293031 as a simple table

n	a(n)
1	1
2	2
3	7
4	27
5	143
6	837
7	5529
8	38305
9	276441
10	2042990
11	15396071
12	117761000
13	912100793
14	7139581543
15	56400579759
16	449129924559

[1,2,7,27,143,837,5529,38305,276441,2042990, 15396071,117761000,912100793,7139581543, 56400579759,449129924559]