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A009266 as a simple table

n a(n)
0 1
1 0
2 0
3 -2
4 0
5 16
6 40
7 -272
8 -1792
9 5696
10 97536
11 -58112
12 -6692224
13 -14752256
14 566971392
15 3293370624
16 -57170149376
17 -629890867200
18 6512209063936
19 128178697854976
20 -759960372641792
21 -28999010130804736
22 64032469498658816

[1,0,0,-2,0,16,40,-272,-1792,5696,97536,-58112,
 -6692224,-14752256,566971392,3293370624,
 -57170149376,-629890867200,6512209063936,
 128178697854976,-759960372641792,
 -28999010130804736,64032469498658816]

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Last modified April 24 22:17 EDT 2024. Contains 371964 sequences. (Running on oeis4.)