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A214521 as a simple table

na(n)
114
241
31144
41414
51441
64114
74141
84411
9111444
10114144
11114414
12114441
13141144
14141414
15141441
16144114
17144141
18144411
19411144
20411414
21411441
22414114
23414141
24414411
25441114
26441141
27441411
28444111
2911114444
3011141444

[14,41,1144,1414,1441,4114,4141,4411,111444,
 114144,114414,114441,141144,141414,141441,144114,
 144141,144411,411144,411414,411441,414114,414141,
 414411,441114,441141,441411,444111,11114444,
 11141444]