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A293567 as a simple table

n a(n)
0 1
1 0
2 -2
3 0
4 12
5 -120
6 -120
7 5040
8 -38640
9 -181440
10 5412960
11 -33264000
12 -478336320
13 12194582400
14 -50871300480
15 -2168559993600
16 49692144902400
17 -59775248332800
18 -15819216007795200
19 329479616206540800
20 1101564635255884800
21 -174845824790757120000

[1,0,-2,0,12,-120,-120,5040,-38640,-181440,
 5412960,-33264000,-478336320,12194582400,
 -50871300480,-2168559993600,49692144902400,
 -59775248332800,-15819216007795200,
 329479616206540800,1101564635255884800,
 -174845824790757120000]

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Last modified October 17 19:24 EDT 2019. Contains 328127 sequences. (Running on oeis4.)