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A281028 as a simple table

n a(n)
1 0
2 0
3 2
4 12
5 58
6 252
7 1048
8 4204
9 16454
10 63236
11 239622
12 897792
13 3332864
14 12277952
15 44938282
16 163566412
17 592492026
18 2137194788
19 7680594760
20 27511516436
21 98254943022
22 349979793492
23 1243627373550
24 4409519905928
25 15603737422416

[0,0,2,12,58,252,1048,4204,16454,63236,239622,
 897792,3332864,12277952,44938282,163566412,
 592492026,2137194788,7680594760,27511516436,
 98254943022,349979793492,1243627373550,
 4409519905928,15603737422416]

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Last modified June 30 02:07 EDT 2024. Contains 373859 sequences. (Running on oeis4.)