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A209449 as a simple table

n a(n)
0 1
1 -2
2 8
3 -10
4 24
5 0
6 280
7 -676
8 1632
9 -1970
10 0
11 0
12 27720
13 -133844
14 646256
15 0
16 941664
17 0
18 10976840
19 -26500436
20 0
21 -154455860
22 0
23 0
24 2173358880
25 -2623476242
26 25334527696
27 -15290740090
28 73830224208
29 0
30 0
31 -1038870091396
32 2508054264192
33 0
34 0
35 0
36 42600007379160

[1,-2,8,-10,24,0,280,-676,1632,-1970,0,0,27720,
 -133844,646256,0,941664,0,10976840,-26500436,0,
 -154455860,0,0,2173358880,-2623476242,25334527696,
 -15290740090,73830224208,0,0,-1038870091396,
 2508054264192,0,0,0,42600007379160]

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Last modified July 29 06:21 EDT 2021. Contains 346340 sequences. (Running on oeis4.)