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A204026 as a triangular array

1
11
121
1221
12321
123321
1235321
12355321
123585321
1235885321
123581385321
12358131385321
1235813211385321
12358

A204026 as a square array

11111111111111
1222222222222
123333333333
12355555555
1235888888
12358131313
123581321
1235813
12358
1235
123
12
1

A204026 as an upper right triangle

11111111111111
1222222222222
123333333333
12355555555
1235888888
12358131313
123581321
1235813
12358
1235
123
12
1

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Last modified February 24 04:30 EST 2020. Contains 332197 sequences. (Running on oeis4.)