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A255050 as a simple table

n a(n)
0 1
1 4
2 20
3 80
4 305
5 1072
6 3622
7 11676
8 36450
9 110240
10 324936
11 935076
12 2635338
13 7285560
14 19795370
15 52930360
16 139462956
17 362471020
18 930186694
19 2358867240
20 5915606398
21 14680528648
22 36073675792
23 87816701332
24 211891552280
25 506981067168
26 1203337174120
27 2834401172172

[1,4,20,80,305,1072,3622,11676,36450,110240,
 324936,935076,2635338,7285560,19795370,52930360,
 139462956,362471020,930186694,2358867240,
 5915606398,14680528648,36073675792,87816701332,
 211891552280,506981067168,1203337174120,
 2834401172172]

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Last modified April 24 17:10 EDT 2024. Contains 371962 sequences. (Running on oeis4.)