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A085542 as a simple table

n a(n)
1 1
2 -1
3 2
4 -2
5 8
6 16
7 -96
8 96
9 -192
10 -768
11 7680
12 15360
13 -184320
14 -1105920
15 -8847360
16 8847360
17 -141557760
18 -283115520
19 5096079360
20 20384317440
21 244611809280
22 2446118092800
23 -53814598041600
24 -107629196083200
25 430516784332800
26 5166201411993600
27 -10332402823987200

[1,-1,2,-2,8,16,-96,96,-192,-768,7680,15360,
 -184320,-1105920,-8847360,8847360,-141557760,
 -283115520,5096079360,20384317440,244611809280,
 2446118092800,-53814598041600,-107629196083200,
 430516784332800,5166201411993600,
 -10332402823987200]

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Last modified November 16 12:40 EST 2018. Contains 317272 sequences. (Running on oeis4.)