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A012408 as a simple table

n a(n)
0 1
1 1
2 3
3 8
4 25
5 100
6 465
7 2186
8 10273
9 58568
10 428193
11 2778382
12 11360177
13 71102044
14 1639157169
15 15866637762
16 -85280723135
17 -1590866608240
18 41214840121921
19 683822331420054
20 -11338214469525167

[1,1,3,8,25,100,465,2186,10273,58568,428193,
 2778382,11360177,71102044,1639157169,15866637762,
 -85280723135,-1590866608240,41214840121921,
 683822331420054,-11338214469525167]

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Last modified September 19 03:31 EDT 2021. Contains 347550 sequences. (Running on oeis4.)