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A274138 as a triangular array

1
11
111
1222
12223
122333
1233344
12334455
123444555
1234445555
12344556555
123445566666
1234556667777
12345666677888

A274138 as a square array

11111111111111
1122222222222
122233333333
22333444444
3334444455
344445556
45555566
5556666
555666
55677
5677
678
78
8

A274138 as an upper right triangle

11111111111111
1122222222222
122233333333
22333444444
3334444455
344445556
45555566
5556666
555666
55677
5677
678
78
8

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Last modified July 4 14:51 EDT 2020. Contains 335448 sequences. (Running on oeis4.)