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A321565 as a simple table

n a(n)
1 1
2 -513
3 19684
4 -261633
5 1953126
6 -10097892
7 40353608
8 -133955073
9 387440173
10 -1001953638
11 2357947692
12 -5149983972
13 10604499374
14 -20701400904
15 38445332184
16 -68584996353
17 118587876498
18 -198756808749
19 322687697780
20 -511002214758

[1,-513,19684,-261633,1953126,-10097892,40353608,
 -133955073,387440173,-1001953638,2357947692,
 -5149983972,10604499374,-20701400904,38445332184,
 -68584996353,118587876498,-198756808749,
 322687697780,-511002214758]

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Last modified June 5 12:47 EDT 2020. Contains 334840 sequences. (Running on oeis4.)