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A057393 as a simple table

n a(n)
0 1
1 0
2 0
3 4
4 6
5 18
6 46
7 132
8 408
9 1254
10 4110
11 13440
12 46420
13 160428
14 572706
15 2057252
16 7544784
17 27882252
18 104455308
19 394319118
20 1503100560
21 5768874688
22 22304692368
23 86749353342
24 339380104380
25 1334443604172
26 5272470030306

[1,0,0,4,6,18,46,132,408,1254,4110,13440,46420,
 160428,572706,2057252,7544784,27882252,104455308,
 394319118,1503100560,5768874688,22304692368,
 86749353342,339380104380,1334443604172,
 5272470030306]

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Last modified May 11 07:10 EDT 2024. Contains 372388 sequences. (Running on oeis4.)