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A074413 as a simple table

n a(n)
1 0
2 0
3 2
4 6
5 16
6 44
7 128
8 440
9 1706
10 6496
11 24576
12 90004
13 327680
14 1198336
15 4438966
16 16645120
17 62914560
18 238602228
19 905969664
20 3442672434
21 13102206738
22 49977802752
23 191126044672
24 732649663000
25 2814062572336
26 10825959342080
27 41705086880768
28 160862475536676

[0,0,2,6,16,44,128,440,1706,6496,24576,90004,
 327680,1198336,4438966,16645120,62914560,
 238602228,905969664,3442672434,13102206738,
 49977802752,191126044672,732649663000,
 2814062572336,10825959342080,41705086880768,
 160862475536676]

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Last modified April 19 19:02 EDT 2024. Contains 371798 sequences. (Running on oeis4.)