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A174846 as a simple table

n a(n)
0 1
1 2
2 6
3 20
4 66
5 212
6 756
7 3320
8 11346
9 -11068
10 14556
11 7202120
12 18928476
13 -1376971048
14 -3526491144
15 394396083920
16 1016723438706
17 -148493230507228
18 -383613651929844
19 71479338751223720
20 184867683069498036

[1,2,6,20,66,212,756,3320,11346,-11068,14556,
 7202120,18928476,-1376971048,-3526491144,
 394396083920,1016723438706,-148493230507228,
 -383613651929844,71479338751223720,
 184867683069498036]

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Last modified April 25 09:13 EDT 2024. Contains 371967 sequences. (Running on oeis4.)