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 A337132 a(n) is the number of squares at distance n from the central square of a Vicsek fractal. 2
 1, 4, 4, 4, 12, 4, 4, 12, 4, 4, 12, 12, 12, 36, 4, 4, 12, 4, 4, 12, 12, 12, 36, 4, 4, 12, 4, 4, 12, 12, 12, 36, 12, 12, 36, 12, 12, 36, 36, 36, 108, 4, 4, 12, 4, 4, 12, 12, 12, 36, 4, 4, 12, 4, 4, 12, 12, 12, 36, 12, 12, 36, 12, 12, 36, 36, 36, 108, 4, 4, 12 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 COMMENTS For symmetry reasons, a(n) is a multiple of 4 for any n > 0. LINKS Rémy Sigrist, Table of n, a(n) for n = 0..6561 Rémy Sigrist, Illustration of initial terms Rémy Sigrist, PARI program for A337132 Wikipedia, Vicsek fractal FORMULA a(n) = 4 iff n belongs to A153775. PROG (PARI) See Links section. CROSSREFS See A337018 for similar sequences. Cf. A153775. Sequence in context: A220931 A219578 A219373 * A151906 A151896 A267191 Adjacent sequences: A337129 A337130 A337131 * A337133 A337134 A337135 KEYWORD nonn AUTHOR Rémy Sigrist, Nov 21 2020 STATUS approved

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Last modified September 7 19:14 EDT 2024. Contains 375749 sequences. (Running on oeis4.)