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A074411 as a simple table

n a(n)
1 0
2 0
3 2
4 4
5 16
6 36
7 128
8 440
9 1706
10 6560
11 24576
12 90046
13 327680
14 1197824
15 4438966
16 16645120
17 62914560
18 238609052
19 905969664
20 3442670796
21 13102206738
22 49977704448
23 191126044672
24 732649663000
25 2814062572336
26 10825960652800
27 41705086880768
28 160862475611574

[0,0,2,4,16,36,128,440,1706,6560,24576,90046,
 327680,1197824,4438966,16645120,62914560,
 238609052,905969664,3442670796,13102206738,
 49977704448,191126044672,732649663000,
 2814062572336,10825960652800,41705086880768,
 160862475611574]

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Last modified April 24 15:57 EDT 2024. Contains 371961 sequences. (Running on oeis4.)