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A156439 as a simple table

n a(n)
4 2
5 3
6 0
7 0
8 480
9 2400
10 0
11 0
12 7574400
13 66083040
14 0
15 0
16 896812758240
17 10058239033920
18 0
19 0
20 374736233227188672
21 5125335197750964000
22 0
23 0

[2,3,0,0,480,2400,0,0,7574400,66083040,0,0,
 896812758240,10058239033920,0,0,
 374736233227188672,5125335197750964000,0,0]

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Last modified February 26 22:44 EST 2024. Contains 370354 sequences. (Running on oeis4.)