About Wobbly II:

This sequence was first described by Stern and Brocot. It seems to wander around a bit unpredictably, beginning like this: 1, 1, 2, 1, 3, 2, 3, 1, 4, 3, 5, 2, 5, 3, 4, 1, 5, 4, 7, 3, 8, 5, 7, 2, 7, 5, 8, 3, 7, 4, 5, 1, 6, 5, 9, 4, 11, 7, 10, 3, 11, 8, 13, 5, 12...

The recursive formula for this sequence varies depending on whether each term is even or odd, causing the somewhat unpredictable behavior of the terms.

To switch the musical structure to this mode, click on the Change button.

Reference: N. J. A. Sloane, editor (2002), The On-Line Encyclopedia of Integer Sequences, published electronically at http://www.research.att.com/~njas/sequences. Sequence A002487.