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A169696 as a simple table

n a(n)
1 0
2 0
3 0
4 8
5 0
6 0
7 52
8 396
9 560
10 3048
11 10672
12 57248
13 128864
14 646272
15 1838784
16 8636880
17 23400992
18 105865688
19 305753680
20 1322849752
21 3862974304
22 16225820000
23 48744080192
24 198673312880
25 607041217056
26 2417584484232
27 7519864632928
28 29320809649000
29 92507134938336

[0,0,0,8,0,0,52,396,560,3048,10672,57248,128864,
 646272,1838784,8636880,23400992,105865688,
 305753680,1322849752,3862974304,16225820000,
 48744080192,198673312880,607041217056,
 2417584484232,7519864632928,29320809649000,
 92507134938336]

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Last modified December 13 16:57 EST 2017. Contains 295959 sequences.