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A008993 as a simple table

n a(n)
0 1
1 -1
2 -1
3 -53
4 -191
5 -20353
6 -16080599
7 -2454263
8 -1929502811
9 -234796649489321
10 -5861873873476337
11 -216960814836289519
12 -709848919641928941541
13 -3162120754204994494571
14 -2121145877577124094947
15 -25314492944947070077552347103
16 -1647232883667178291585597345249

[1,-1,-1,-53,-191,-20353,-16080599,-2454263,
 -1929502811,-234796649489321,-5861873873476337,
 -216960814836289519,-709848919641928941541,
 -3162120754204994494571,-2121145877577124094947,
 -25314492944947070077552347103,
 -1647232883667178291585597345249]

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Last modified September 25 11:26 EDT 2020. Contains 337337 sequences. (Running on oeis4.)