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

Author

Rémy Sigrist, Nov 21 2020

Keywords

• nonn

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

Crossrefs

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

Cf. A007051.

Programs

PARI

See Links section.

Formula

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