In the diagram below, five octaves (i.e., sets of 12 consecutive keys) have been omitted (as represented by the ellipses):
.
n | 1 2 3 ... 14 15
----+---------------------------------------------------------
a(n)| 1 2 3 ... 2 3
______________________________ ... _________________________
| |/| | |/||/| | |/||/||/| | | |/||/| | |/||/||/| | |
| |/| | |/||/| | |/||/||/| | | |/||/| | |/||/||/| | |
| |/| | |/||/| | |/||/||/| | | |/||/| | |/||/||/| | |
| |_| | |_||_| | |_||_||_| | | |_||_| | |_||_||_| | |
| | | | | | | | | | | | | | | | | | |
| | | | | | | | | | | | | | | | | | |
|__|__|__|__|__|__|__|__|__| |__|__|__|__|__|__|__|__|
A B C D E F G A B ... C D E F G A B C
(End)
|