A323827 Apply Lenormand's "raboter" operation to A306211.

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

Offset: 1

Author

N. J. A. Sloane, Feb 01 2019

Keywords

• nonn

Comments

The operation shortens each run of consecutive equal terms by one term (runs of length 1 vanish).

Links

• Rémy Sigrist, Table of n, a(n) for n = 1..16502
• Claude Lenormand, Deux transformations sur les mots, Preprint, 5 pages, Nov 17 2003. Apparently unpublished. This is a scanned copy of the version that the author sent to me in 2003.
• Rémy Sigrist, PARI program for A323827

Crossrefs

Cf. A306211, A318921.

Programs

PARI

See Links section.

Extensions

More terms from Rémy Sigrist, Nov 11 2020