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A183893 as a simple table

n a(n)
0 1
1 1
2 -1
3 -1
4 9
5 9
6 -73
7 -73
8 697
9 697
10 -7161
11 -7161
12 77457
13 77457
14 -868881
15 -868881
16 10016241
17 10016241
18 -117935473
19 -117935473
20 1412307481
21 1412307481
22 -17148100569
23 -17148100569
24 210619695913
25 210619695913
26 -2612194773481
27 -2612194773481
28 32668519882017
29 32668519882017
30 -411515480555553

[1,1,-1,-1,9,9,-73,-73,697,697,-7161,-7161,77457,
 77457,-868881,-868881,10016241,10016241,
 -117935473,-117935473,1412307481,1412307481,
 -17148100569,-17148100569,210619695913,
 210619695913,-2612194773481,-2612194773481,
 32668519882017,32668519882017,-411515480555553]

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Last modified January 22 13:47 EST 2021. Contains 340362 sequences. (Running on oeis4.)