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A171998 as a simple table

n a(n)
1 1
2 1
3 1
4 1
5 3
6 1
7 -5
8 7
9 6
10 1
11 -65
12 -15
13 25
14 10
15 1
16 -455
17 -455
18 0
19 65
20 15
21 1
22 -1295
23 -4725
24 -1715
25 140
26 140
27 21
28 1

[1,1,1,1,3,1,-5,7,6,1,-65,-15,25,10,1,-455,-455,0,
 65,15,1,-1295,-4725,-1715,140,140,21,1]

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Last modified August 13 05:41 EDT 2020. Contains 336442 sequences. (Running on oeis4.)