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A020452 as a simple table

n a(n)
1 11
2 41
3 4111
4 4441
5 11411
6 14411
7 41141
8 41411
9 44111
10 1114111
11 1144141
12 1144441
13 1411141
14 1411411
15 1441411
16 1444111
17 1444411
18 1444441
19 4141441
20 4414411
21 4441111
22 4441441
23 11111141
24 11141111
25 11141441
26 11441141
27 11441411
28 14111441
29 14141411

[11,41,4111,4441,11411,14411,41141,41411,44111,
 1114111,1144141,1144441,1411141,1411411,1441411,
 1444111,1444411,1444441,4141441,4414411,4441111,
 4441441,11111141,11141111,11141441,11441141,
 11441411,14111441,14141411]

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Last modified April 26 12:16 EDT 2019. Contains 322472 sequences. (Running on oeis4.)