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A036511 as a simple table

n a(n)
1 4
2 144
3 1444
4 44944
5 6441444
6 47444544
7 4434494464
8 44424414441
9 4243443441444
10 44844344414464
11 444431244445444
12 44044624434444544
13 441544444344443449
14 14444545446449449444
15 346454444084444444644
16 44024844440444424044544
17 444448493447444044441744

[4,144,1444,44944,6441444,47444544,4434494464,
 44424414441,4243443441444,44844344414464,
 444431244445444,44044624434444544,
 441544444344443449,14444545446449449444,
 346454444084444444644,44024844440444424044544,
 444448493447444044441744]

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Last modified January 17 10:30 EST 2019. Contains 319218 sequences. (Running on oeis4.)