A266503 - OEIS

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A266503 as a simple table

n	a(n)
1	0
2	0
3	0
4	0
5	0
6	15
7	105
8	735
9	4095
10	26775
11	162855
12	1105335
13	7187895
14	51126075
15	356831475
16	2676468795
17	19890931515
18	156769986555
19	1232704469115
20	10178240218875
21	84190426730235
22	725667326178795

[0,0,0,0,0,15,105,735,4095,26775,162855,1105335, 7187895,51126075,356831475,2676468795,19890931515, 156769986555,1232704469115,10178240218875, 84190426730235,725667326178795]