A177598 - OEIS

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A177598 as a simple table

n	a(n)
1	1
2	15
3	767
4	93621
5	22431655
6	9362799454
7	6260161965339
8	6298506200484865
9	9087853319185940117
10	18101094912700638755191

[1,15,767,93621,22431655,9362799454,6260161965339, 6298506200484865,9087853319185940117, 18101094912700638755191]