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A178956 as a simple table

n a(n)
0 1
1 -1
2 0
3 1
4 1
5 -1
6 -7
7 -13
8 169
9 233
10 17
11 -18847
12 -43957
13 26023
14 429007
15 31505483
16 -31381783
17 -753299101
18 -7372705283
19 195152846389
20 632396244331
21 -52258919107
22 -447065769153911
23 -13584264183406001
24 34831349327448893
25 674219621951483119
26 2113978805943481381
27 -6602691591860999071
28 -370308752490094361609
29 -95867348590727618473
30 752151788353653780085507

[1,-1,0,1,1,-1,-7,-13,169,233,17,-18847,-43957,
 26023,429007,31505483,-31381783,-753299101,
 -7372705283,195152846389,632396244331,
 -52258919107,-447065769153911,-13584264183406001,
 34831349327448893,674219621951483119,
 2113978805943481381,-6602691591860999071,
 -370308752490094361609,-95867348590727618473,
 752151788353653780085507]

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Last modified February 28 01:55 EST 2020. Contains 332319 sequences. (Running on oeis4.)