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A111979 as a simple table

n a(n)
0 0
1 1
2 0
3 16
4 0
5 1536
6 0
7 -319488
8 0
9 36007575552
10 0
11 -53682434054553600
12 0
13 1790644857560674043166720
14 0
15 -1280831660558056667387645027942400
16 0
17 18961467116136182692294341450867551502336000
18 0

[0,1,0,16,0,1536,0,-319488,0,36007575552,0,
 -53682434054553600,0,1790644857560674043166720,0,
 -1280831660558056667387645027942400,0,
 18961467116136182692294341450867551502336000,0]

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Last modified January 28 22:40 EST 2020. Contains 331328 sequences. (Running on oeis4.)