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A012863 as a simple table

n a(n)
0 0
1 -1
2 -1
3 -1
4 3
5 -19
6 59
7 -751
8 174989
9 -2857
10 2249927
11 -434293
12 32401403009
13 -8181904909
14 1150205658377
15 -5044289
16 64371087485333
17 -5026792806787
18 3500507461200889
19 -69028763155644023
20 67179942704167004419
21 -1022779523247467
22 348074852007121792219
23 -750218743980105669781
24 129827894444079903690116761

[0,-1,-1,-1,3,-19,59,-751,174989,-2857,2249927,
 -434293,32401403009,-8181904909,1150205658377,
 -5044289,64371087485333,-5026792806787,
 3500507461200889,-69028763155644023,
 67179942704167004419,-1022779523247467,
 348074852007121792219,-750218743980105669781,
 129827894444079903690116761]

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Last modified March 29 08:13 EDT 2024. Contains 371265 sequences. (Running on oeis4.)