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A013539 as a simple table

n a(n)
0 -1
1 13
2 877
3 2675
4 8260913
5 410433607
6 223758294041
7 27276568423051
8 127639993821278611
9 10512596641186789291
10 8302408982767874894797
11 3077103479886222660379217

[-1,13,877,2675,8260913,410433607,223758294041,
 27276568423051,127639993821278611,
 10512596641186789291,8302408982767874894797,
 3077103479886222660379217]

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Last modified August 7 15:30 EDT 2020. Contains 336276 sequences. (Running on oeis4.)