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A003728 as a simple table

n a(n)
0 0
1 1
2 -1
3 -1
4 6
5 -31
6 120
7 -337
8 -784
9 24705
10 -288000
11 2451679
12 -14032128
13 -17936543
14 2173889536
15 -42895630065
16 583266662400
17 -5396647099903
18 5119183650816
19 1239561882325439
20 -36754121131294720
21 708575518706816481

[0,1,-1,-1,6,-31,120,-337,-784,24705,-288000,
 2451679,-14032128,-17936543,2173889536,
 -42895630065,583266662400,-5396647099903,
 5119183650816,1239561882325439,-36754121131294720,
 708575518706816481]

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Last modified August 13 08:18 EDT 2022. Contains 356079 sequences. (Running on oeis4.)