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A173841 as a simple table

n a(n)
0 1
1 1
2 0
3 2
4 8
5 48
6 240
7 1968
8 13824
9 140160
10 1263360
11 15298560
12 168422400
13 2373073920
14 30865121280
15 496199854080
16 7445355724800
17 134510244986880
18 2287168006717440
19 45877376537395200
20 871804170613555200
21 19225435113632563200
22 403779880746418176000

[1,1,0,2,8,48,240,1968,13824,140160,1263360,
 15298560,168422400,2373073920,30865121280,
 496199854080,7445355724800,134510244986880,
 2287168006717440,45877376537395200,
 871804170613555200,19225435113632563200,
 403779880746418176000]

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Last modified March 29 10:59 EDT 2024. Contains 371277 sequences. (Running on oeis4.)