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A001568 as a simple table

n a(n)
1 1
2 -1
3 -1
4 2
5 49
6 629
7 6961
8 38366
9 -1899687
10 -133065253
11 -6482111309
12 -281940658286
13 -10702380933551
14 -247708227641863
15 14512103549430397
16 3377044611825908414
17 433180638973276282801
18 47474992085447610990231

[1,-1,-1,2,49,629,6961,38366,-1899687,-133065253,
 -6482111309,-281940658286,-10702380933551,
 -247708227641863,14512103549430397,
 3377044611825908414,433180638973276282801,
 47474992085447610990231]

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Last modified April 23 09:22 EDT 2024. Contains 371905 sequences. (Running on oeis4.)