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A003414 as a simple table

n a(n)
1 -1
2 0
3 -1
4 0
5 -1
6 0
7 -1
8 0
9 -2
10 13
11 -141
12 1803
13 -27414
14 487468
15 -10026348
16 236192433
17 -6317862398
18 190439655626
19 -6425425249653
20 241207241774250
21 -10020155328258127
22 458387180159766538
23 -22989944171828251746
24 1259023596072554784854
25 -75008667460769643668558

[-1,0,-1,0,-1,0,-1,0,-2,13,-141,1803,-27414,
 487468,-10026348,236192433,-6317862398,
 190439655626,-6425425249653,241207241774250,
 -10020155328258127,458387180159766538,
 -22989944171828251746,1259023596072554784854,
 -75008667460769643668558]

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Last modified April 13 00:24 EDT 2021. Contains 342934 sequences. (Running on oeis4.)