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A131406 as a triangular array

1
21
121
2121
12121
212121
1212121
21212121
121212121
2121212121

A131406 as a square array

1212121212
121212121
12121212
1212121
121212
12121
1212
121
12
1

A131406 as an upper right triangle

1212121212
121212121
12121212
1212121
121212
12121
1212
121
12
1

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Last modified November 22 00:32 EST 2019. Contains 329383 sequences. (Running on oeis4.)