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

1,2

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.

Links

Table of n, a(n) for n=1..18.

Crossrefs

Cf. A058986.

Sequence in context: A034002 A276630 A176048 * A366785 A322480 A251683

Adjacent sequences: A359138 A359139 A359140 * A359142 A359143 A359144

Keyword

nonn,more

Author

N. J. A. Sloane, Jan 26 2023

Status

approved