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A012868 as a simple table

n a(n)
0 0
1 -1
2 -1
3 -1
4 347
5 -1531
6 590267
7 -37723537
8 1103996977
9 -2158074791
10 328785573754709
11 -134852375996381
12 3427455470023873621
13 -13844935285148389217
14 6142449451071240707
15 -43761094586606903148089
16 37938502177281712935274975819
17 -110450564689571423030247983611
18 4389621268440117526955711378765711

[0,-1,-1,-1,347,-1531,590267,-37723537,1103996977,
 -2158074791,328785573754709,-134852375996381,
 3427455470023873621,-13844935285148389217,
 6142449451071240707,-43761094586606903148089,
 37938502177281712935274975819,
 -110450564689571423030247983611,
 4389621268440117526955711378765711]

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Last modified January 26 06:32 EST 2021. Contains 340434 sequences. (Running on oeis4.)