A067420 - OEIS

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A067420 as a simple table

n	a(n)
0	1
1	7
2	105
3	1575
4	23625
5	354375
6	5315625
7	79734375
8	1196015625
9	17940234375
10	269103515625
11	4036552734375
12	60548291015625
13	908224365234375
14	13623365478515625
15	204350482177734375
16	3065257232666015625

[1,7,105,1575,23625,354375,5315625,79734375, 1196015625,17940234375,269103515625,4036552734375, 60548291015625,908224365234375,13623365478515625, 204350482177734375,3065257232666015625]