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A051685 as a simple table

n a(n)
1 0
2 0
3 0
4 -6
5 -30
6 0
7 420
8 2100
9 6804
10 -20160
11 -376200
12 -2102760
13 -6606600
14 53237184
15 965306160
16 5941244400
17 12774059760
18 -305998041600
19 -5264368533216
20 -33983490935520
21 -16008359119200
22 3139364813249280
23 52132631033313600
24 341037535726730304
25 -715693892444414400

[0,0,0,-6,-30,0,420,2100,6804,-20160,-376200,
 -2102760,-6606600,53237184,965306160,5941244400,
 12774059760,-305998041600,-5264368533216,
 -33983490935520,-16008359119200,3139364813249280,
 52132631033313600,341037535726730304,
 -715693892444414400]

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Last modified March 28 20:05 EDT 2024. Contains 371254 sequences. (Running on oeis4.)