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A091526 as a simple table

n a(n)
0 1
1 -1
2 1
3 2
4 9
5 34
6 130
7 496
8 1897
9 7274
10 27966
11 107788
12 416394
13 1611908
14 6251596
15 24287212
16 94499689
17 368202778
18 1436458486
19 5610483532
20 21936442894
21 85852554748
22 336300861436
23 1318441228432
24 5172792817834
25 20309402206084

[1,-1,1,2,9,34,130,496,1897,7274,27966,107788,
 416394,1611908,6251596,24287212,94499689,
 368202778,1436458486,5610483532,21936442894,
 85852554748,336300861436,1318441228432,
 5172792817834,20309402206084]

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Last modified April 20 00:02 EDT 2024. Contains 371798 sequences. (Running on oeis4.)