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A005447 as a simple table

n a(n)
0 1
1 1
2 1
3 1
4 -1
5 1
6 1
7 -139
8 1
9 -571
10 -281
11 163879
12 -5221
13 5246819
14 5459
15 -534703531
16 91207079
17 -4483131259
18 -2650986803
19 432261921612371
20 -6171801683
21 6232523202521089
22 4283933145517
23 -25834629665134204969
24 11963983648109

[1,1,1,1,-1,1,1,-139,1,-571,-281,163879,-5221,
 5246819,5459,-534703531,91207079,-4483131259,
 -2650986803,432261921612371,-6171801683,
 6232523202521089,4283933145517,
 -25834629665134204969,11963983648109]

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Last modified March 29 10:44 EDT 2024. Contains 371268 sequences. (Running on oeis4.)