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A122598 as a simple table

n a(n)
0 0
1 1
2 2
3 2
4 -4
5 -16
6 0
7 96
8 192
9 -384
10 -3840
11 -3840
12 69120
13 184320
14 -1290240
15 -5160960
16 25804800
17 134184960
18 -557383680
19 -3530096640
20 13005619200
21 96613171200
22 -326998425600
23 -2779486617600
24 8828957491200
25 84365593804800
26 -255058771968000
27 -2703622982860800
28 7855810176614400

[0,1,2,2,-4,-16,0,96,192,-384,-3840,-3840,69120,
 184320,-1290240,-5160960,25804800,134184960,
 -557383680,-3530096640,13005619200,96613171200,
 -326998425600,-2779486617600,8828957491200,
 84365593804800,-255058771968000,-2703622982860800,
 7855810176614400]

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Last modified March 29 00:26 EDT 2024. Contains 371264 sequences. (Running on oeis4.)