A152797 - OEIS

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A152797 as a simple table

n	a(n)
0	1
1	1
2	7
3	63
4	847
5	18319
6	664335
7	41472271
8	4540159247
9	884033807631
10	309652466058511
11	196950960066643215
12	229271330666175448335
13	491789255473294398113039
14	1955120793071758250021405967

[1,1,7,63,847,18319,664335,41472271,4540159247, 884033807631,309652466058511,196950960066643215, 229271330666175448335,491789255473294398113039, 1955120793071758250021405967]