A359141 First differences of the pancake flipping (or sorting by prefix reversal) sequence A058986.

1, 2, 1, 1, 2, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 2

Offset: 1

Author

N. J. A. Sloane, Jan 26 2023

Keywords

• nonn
• more

Comments

A comment in A058986 implies that the terms are at most 2. Furthermore a zero term seems unlikely.

The initial terms consist of runs of 1, 2, 4, and 7 1's separated by 2's, which allows for a large number of extensions.

Crossrefs

Cf. A058986.