A003987 as tables, graphs or sounds

A003987 formatted 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

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

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

2 3 0 1 6 7 4 5 10 11 8

3 2 1 0 7 6 5 4 11 10

4 5 6 7 0 1 2 3 12

5 4 7 6 1 0 3 2

6 7 4 5 2 3 0

7 6 5 4 3 2

8 9 10 11 12

9 8 11 10

10 11 8

11 10

12