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A137981 as a simple table

n a(n)
1 2
2 -3
3 30
4 -92
5 -120
6 696
7 720
8 -8340
9 -5220
10 24120
11 40296
12 103680
13 -722160
14 -289440
15 1216080
16 -756000
17 10579800
18 13003200
19 -73306800
20 -21281400
21 86350320
22 -71284800
23 -268531200
24 2283140160
25 1799884800
26 -9170280000
27 -2072407680
28 8319024000
29 2438553600
30 -41653241280

[2,-3,30,-92,-120,696,720,-8340,-5220,24120,40296,
 103680,-722160,-289440,1216080,-756000,10579800,
 13003200,-73306800,-21281400,86350320,-71284800,
 -268531200,2283140160,1799884800,-9170280000,
 -2072407680,8319024000,2438553600,-41653241280]

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Last modified May 30 02:13 EDT 2024. Contains 372957 sequences. (Running on oeis4.)