A337018 a(n) is the number of hexagons at distance n from the central hexagon of a hexaflake.

1, 6, 6, 18, 18, 6, 18, 18, 18, 54, 54, 30, 54, 42, 6, 18, 18, 18, 54, 54, 30, 54, 42, 18, 54, 54, 54, 162, 162, 90, 162, 126, 30, 90, 90, 66, 162, 150, 78, 126, 90, 6, 18, 18, 18, 54, 54, 30, 54, 42, 18, 54, 54, 54, 162, 162, 90, 162, 126, 30, 90, 90, 66, 162

Offset

0,2

Comments

For symmetry reasons, a(n) is a multiple of 6 for any n > 0.

Links

Rémy Sigrist, Table of n, a(n) for n = 0..3281

Rémy Sigrist, Illustration of initial terms

Rémy Sigrist, PARI program for A337018

Wikipedia, Hexaflake

Formula

a(n) = 6 iff n belongs to A007051.

Prog

(PARI) See Links section.

Crossrefs

Cf. A337132 (Vicsek fractal analog), A337545 (pentaflake analog), A339124 (golden square fractal analog).

Cf. A007051.

Sequence in context: A315816 A315817 A325696 * A315818 A315819 A301682

Adjacent sequences: A337015 A337016 A337017 * A337019 A337020 A337021

Keyword

nonn

Author

Rémy Sigrist, Nov 21 2020

Status

approved