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A303391 as a simple table

n a(n)
0 1
1 8
2 40
3 200
4 872
5 3720
6 15400
7 62920
8 254440
9 1024648
10 4112680
11 16483400
12 66000360
13 264150920
14 1056903080
15 4228272200
16 16914393832
17 67660396040
18 270647139240
19 1082600410440
20 4330424811880
21 17321748357640
22 69287088965800
23 277148557003720
24 1108594618342760

[1,8,40,200,872,3720,15400,62920,254440,1024648,
 4112680,16483400,66000360,264150920,1056903080,
 4228272200,16914393832,67660396040,270647139240,
 1082600410440,4330424811880,17321748357640,
 69287088965800,277148557003720,1108594618342760]

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Last modified April 25 01:35 EDT 2024. Contains 371964 sequences. (Running on oeis4.)