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A013234 as a simple table

n a(n)
0 0
1 0
2 -1
3 0
4 -6
5 8
6 -105
7 448
8 -3780
9 29360
10 -231525
11 2498848
12 -20985426
13 271494104
14 -2503393893
15 35568205216
16 -346194368520
17 4969746747488
18 -41862411119529
19 433992302190016
20 4063211694577570
21 -232678981367758168

[0,0,-1,0,-6,8,-105,448,-3780,29360,-231525,
 2498848,-20985426,271494104,-2503393893,
 35568205216,-346194368520,4969746747488,
 -41862411119529,433992302190016,4063211694577570,
 -232678981367758168]

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Last modified February 2 21:10 EST 2023. Contains 360024 sequences. (Running on oeis4.)