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A294255 as a simple table

n a(n)
0 1
1 -1
2 -1
3 11
4 -23
5 -101
6 991
7 -1849
8 -24751
9 220823
10 -174689
11 -10924541
12 87639289
13 105372851
14 -7496679553
15 52397291519
16 238887991201
17 -7313210597969
18 41947208776639
19 440627548672763
20 -9537975555701239
21 39732691614159179
22 916052993052974239

[1,-1,-1,11,-23,-101,991,-1849,-24751,220823,
 -174689,-10924541,87639289,105372851,-7496679553,
 52397291519,238887991201,-7313210597969,
 41947208776639,440627548672763,-9537975555701239,
 39732691614159179,916052993052974239]

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Last modified August 3 08:53 EDT 2020. Contains 336197 sequences. (Running on oeis4.)