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A087515 as a simple table

n a(n)
0 19
1 11919199
2 11919991
3 19111999
4 19199119
5 19911919
6 19991911
7 91919911
8 91999111
9 99111919
10 99119191
11 99919111
12 1111919999
13 1111999199
14 1191911999
15 1191919991
16 1191991991
17 1191999119
18 1199911919
19 1199911991
20 1199919191

[19,11919199,11919991,19111999,19199119,19911919,
 19991911,91919911,91999111,99111919,99119191,
 99919111,1111919999,1111999199,1191911999,
 1191919991,1191991991,1191999119,1199911919,
 1199911991,1199919191]

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Last modified May 3 05:44 EDT 2024. Contains 372205 sequences. (Running on oeis4.)