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A172194 as a simple table

n a(n)
0 0
1 1
2 1
3 2
4 2
5 19
6 19
7 23
8 23
9 131
10 131
11 808
12 808
13 4469
14 4469
15 24221
16 24221
17 -2797103
18 -2797103
19 80009738
20 80009738
21 -930456539
22 -930456539
23 127441603151
24 127441603151
25 -6013673706973
26 -6013673706973
27 149990847412508
28 149990847412508

[0,1,1,2,2,19,19,23,23,131,131,808,808,4469,4469,
 24221,24221,-2797103,-2797103,80009738,80009738,
 -930456539,-930456539,127441603151,127441603151,
 -6013673706973,-6013673706973,149990847412508,
 149990847412508]

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Last modified October 16 16:16 EDT 2019. Contains 328101 sequences. (Running on oeis4.)