A015461 - OEIS

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A015461 as a simple table

n	a(n)
0	0
1	1
2	1
3	5
4	21
5	341
6	5717
7	354901
8	23771733
9	5838469717
10	1563742763605
11	1532083548256853
12	1641235215638133333
13	6427665390003549698645
14	27541785384957544314239573
15	431380864280640133787922528853

[0,1,1,5,21,341,5717,354901,23771733,5838469717, 1563742763605,1532083548256853, 1641235215638133333,6427665390003549698645, 27541785384957544314239573, 431380864280640133787922528853]