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A012865 as a simple table

n a(n)
0 0
1 -1
2 -1
3 67
4 347
5 1417
6 590267
7 35757697
8 1103996977
9 23018952061163
10 328785573754709
11 162948371578537
12 3427455470023873621
13 69202423313396946997
14 6142449451071240707
15 174086353362000718582994221
16 37938502177281712935274975819
17 110449470605872394476263205171
18 4389621268440117526955711378765711

[0,-1,-1,67,347,1417,590267,35757697,1103996977,
 23018952061163,328785573754709,162948371578537,
 3427455470023873621,69202423313396946997,
 6142449451071240707,174086353362000718582994221,
 37938502177281712935274975819,
 110449470605872394476263205171,
 4389621268440117526955711378765711]

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Last modified March 4 04:39 EST 2021. Contains 341779 sequences. (Running on oeis4.)