A251721 - OEIS

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A251721 as a triangular array

1

2 1

3 2 1

5 3 2 1

4 4 3 2 1

7 6 4 3 2 1

11 7 5 4 3 2 1

6 9 6 5 4 3 2 1

13 10 7 6 5 4 3 2 1

17 5 8 7 6 5 4 3 2 1

10 12 10 8 7 6 5 4 3 2 1

19 15 11 9 8 7 6 5 4 3 2 1

9 8 13 10 9 8 7 6 5 4 3 2 1

8 16 14 11 10 9 8 7 6 5 4 3 2 1

23 19 15 12 11 10 9 8 7 6 5 4 3 2 1

A251721 as a square array

1 2 3 5 4 7 11 6 13 17 10 19 9 8 23

1 2 3 4 6 7 9 10 5 12 15 8 16 19

1 2 3 4 5 6 7 8 10 11 13 14 15

1 2 3 4 5 6 7 8 9 10 11 12

1 2 3 4 5 6 7 8 9 10 11

1 2 3 4 5 6 7 8 9 10

1 2 3 4 5 6 7 8 9

1 2 3 4 5 6 7 8

1 2 3 4 5 6 7

1 2 3 4 5 6

1 2 3 4 5

1 2 3 4

1 2 3

1 2

1

A251721 as an upper right triangle