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A247481 as a simple table

n a(n)
0 1
1 1
2 -1
3 -1
4 -2
5 -14
6 -98
7 -822
8 -7948
9 -86590
10 -1046916
11 -13892842
12 -200653570
13 -3133064534
14 -52596852266
15 -944892417438
16 -18091297436248
17 -367841660947508
18 -7916992964642992
19 -179849204152350892
20 -4300928485463624458
21 -108013481381638292266

[1,1,-1,-1,-2,-14,-98,-822,-7948,-86590,-1046916,
 -13892842,-200653570,-3133064534,-52596852266,
 -944892417438,-18091297436248,-367841660947508,
 -7916992964642992,-179849204152350892,
 -4300928485463624458,-108013481381638292266]

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Last modified February 27 06:36 EST 2020. Contains 332299 sequences. (Running on oeis4.)