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A027211 as a simple table

n a(n)
0 1
1 3
2 8
3 22
4 53
5 136
6 312
7 768
8 1712
9 4101
10 8971
11 21082
12 45507
13 105435
14 225347
15 516424
16 1095353
17 2488480
18 5246176
19 11834584
20 24826412
21 55677436
22 116321132
23 259585768
24 540454158
25 1201026646
26 2493149402
27 5520322840
28 11430160964

[1,3,8,22,53,136,312,768,1712,4101,8971,21082,
 45507,105435,225347,516424,1095353,2488480,
 5246176,11834584,24826412,55677436,116321132,
 259585768,540454158,1201026646,2493149402,
 5520322840,11430160964]

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Last modified September 19 11:27 EDT 2021. Contains 347556 sequences. (Running on oeis4.)