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

1,2

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 Apparently unpublished.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

Prog

(PARI) See Links section.

Crossrefs

Cf. A306211, A318921.

Sequence in context: A106825 A156608 A368752 * A275850 A112505 A104638

Adjacent sequences: A323824 A323825 A323826 * A323828 A323829 A323830

Keyword

nonn

Author

N. J. A. Sloane, Feb 01 2019

Extensions

More terms from Rémy Sigrist, Nov 11 2020

Status

approved