A003987 - OEIS

A003987 as a triangular array

0

1 1

2 0 2

3 3 3 3

4 2 0 2 4

5 5 1 1 5 5

6 4 6 0 6 4 6

7 7 7 7 7 7 7 7

8 6 4 6 0 6 4 6 8

9 9 5 5 1 1 5 5 9 9

10 8 10 4 2 0 2 4 10 8 10

11 11 11 11 3 3 3 3 11 11 11 11

12 10 8 10 12 2 0 2 12 10 8 10 12

13 13 9 9 13 13 1 1 13 13 9 9 13 13

0 1 2 3 4 5 6 7 8 9 10 11 12 13

1 0 3 2 5 4 7 6 9 8 11 10 13

2 3 0 1 6 7 4 5 10 11 8 9

3 2 1 0 7 6 5 4 11 10 9

4 5 6 7 0 1 2 3 12 13

5 4 7 6 1 0 3 2 13

6 7 4 5 2 3 0 1

7 6 5 4 3 2 1

8 9 10 11 12 13

9 8 11 10 13

10 11 8 9

11 10 9

12 13

13