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 A239074 Given a circle of radius R into which small circles of radius R/2^n are packed in a "hexagonal pattern" (see Comments), a(n) is the number of points at which a small circle is tangent to the big circle. 4
 2, 2, 6, 2, 6, 6, 6, 2, 18, 6, 2, 18, 6, 18, 54, 2, 6, 54, 6, 6, 90, 2, 2, 54, 54, 18, 54, 18, 6, 162, 6, 2, 18, 6, 18, 1458, 18, 18, 162, 18, 2, 810, 6, 18, 1458, 2, 6, 486, 18, 162, 486, 54, 6, 486, 18, 54, 162, 18, 2, 4374, 6, 18, 2430, 6, 54, 162, 18, 18, 18, 54 (list; graph; refs; listen; history; text; internal format)