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A113572 as a simple table

n a(n)
1 1
2 12
3 123
4 1224
5 12245
6 122424
7 1224265
8 12242424
9 122424246
10 0
11 12242424447
12 122424244428
13 1224242444243
14 12242424442458
15 0
16 1224242444242448
17 12242424442424692
18 122424244424244828
19 1224242444242444367
20 0

[1,12,123,1224,12245,122424,1224265,12242424,
 122424246,0,12242424447,122424244428,
 1224242444243,12242424442458,0,1224242444242448,
 12242424442424692,122424244424244828,
 1224242444242444367,0]

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Last modified June 22 20:39 EDT 2021. Contains 345389 sequences. (Running on oeis4.)