A337018 - OEIS

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A337018

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

4

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

(list; graph; refs; listen; history; text; internal format)

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).

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