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A103639 as a simple table

n a(n)
0 1
1 15
2 945
3 135135
4 34459425
5 13749310575
6 7905853580625
7 6190283353629375
8 6332659870762850625
9 8200794532637891559375
10 13113070457687988603440625
11 25373791335626257947657609375

[1,15,945,135135,34459425,13749310575,
 7905853580625,6190283353629375,
 6332659870762850625,8200794532637891559375,
 13113070457687988603440625,
 25373791335626257947657609375]

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Last modified February 28 10:20 EST 2020. Contains 332323 sequences. (Running on oeis4.)