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A098777 as a simple table

n a(n)
0 1
1 -1
2 -2
3 2
4 16
5 -40
6 -320
7 1040
8 12160
9 -52480
10 -742400
11 3872000
12 66457600
13 -411136000
14 -8202444800
15 58479872000
16 1335009280000
17 -10791497728000
18 -277035646976000
19 2502527565824000
20 71391934873600000
21 -712816377856000000
22 -22367684235100160000
23 244597236078018560000

[1,-1,-2,2,16,-40,-320,1040,12160,-52480,-742400,
 3872000,66457600,-411136000,-8202444800,
 58479872000,1335009280000,-10791497728000,
 -277035646976000,2502527565824000,
 71391934873600000,-712816377856000000,
 -22367684235100160000,244597236078018560000]

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Last modified April 18 14:03 EDT 2021. Contains 343088 sequences. (Running on oeis4.)