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A058414 as a simple table

n a(n)
1 1
2 4
3 144
4 441
5 1444
6 10404
7 40401
8 1004004
9 1100401
10 4004001
11 100040004
12 114041041
13 400040001
14 414041104
15 10000400004
16 10110101401
17 40000400001
18 41011110144
19 141001001001
20 414441100441
21 1000004000004
22 1041110041104

[1,4,144,441,1444,10404,40401,1004004,1100401,
 4004001,100040004,114041041,400040001,414041104,
 10000400004,10110101401,40000400001,41011110144,
 141001001001,414441100441,1000004000004,
 1041110041104]

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Last modified July 14 16:15 EDT 2024. Contains 374322 sequences. (Running on oeis4.)