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A262593 as a simple table

n a(n)
0 1
1 -1
2 -3
3 -1
4 13
5 63
6 237
7 879
8 3357
9 13135
10 52061
11 207519
12 829037
13 3314719
14 13256973
15 53025423
16 212098557
17 848390319
18 3393556477
19 13574220095
20 54296873421
21 217187485439
22 868749932077
23 3474999717039
24 13899998855133
25 55599995405583
26 222399981605277
27 889599926401759
28 3558399705585197

[1,-1,-3,-1,13,63,237,879,3357,13135,52061,207519,
 829037,3314719,13256973,53025423,212098557,
 848390319,3393556477,13574220095,54296873421,
 217187485439,868749932077,3474999717039,
 13899998855133,55599995405583,222399981605277,
 889599926401759,3558399705585197]

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Last modified July 22 08:27 EDT 2019. Contains 325216 sequences. (Running on oeis4.)