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A268586 as a simple table

n a(n)
0 0
1 0
2 0
3 2
4 9
5 30
6 88
7 240
8 624
9 1568
10 3840
11 9216
12 21760
13 50688
14 116736
15 266240
16 602112
17 1351680
18 3014656
19 6684672
20 14745600
21 32374784
22 70778880
23 154140672
24 334495744
25 723517440
26 1560281088
27 3355443200
28 7197425664
29 15401484288
30 32883343360

[0,0,0,2,9,30,88,240,624,1568,3840,9216,21760,
 50688,116736,266240,602112,1351680,3014656,
 6684672,14745600,32374784,70778880,154140672,
 334495744,723517440,1560281088,3355443200,
 7197425664,15401484288,32883343360]

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Last modified May 10 08:52 EDT 2024. Contains 372373 sequences. (Running on oeis4.)