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A256571 a(n) is the total number of pentagrams in a variant of pentagram fractal after n iterations. 7
1, 6, 21, 56, 131, 281, 556, 1046, 1891 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Inspired by A255870. But at the higher iterations, the perimeter is an irregular polygon instead of a pentagon. The construction rule is sides to vertices expansion. See illustration in the links.

LINKS

Table of n, a(n) for n=1..9.

Kival Ngaokrajang, Illustration of initial terms

CROSSREFS

Cf. A255870, A256429, A256569.

Sequence in context: A058484 A145455 A145134 * A247904 A074745 A296821

Adjacent sequences:  A256568 A256569 A256570 * A256572 A256573 A256574

KEYWORD

nonn,more

AUTHOR

Kival Ngaokrajang, Apr 02 2015

STATUS

approved

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Last modified September 27 09:09 EDT 2020. Contains 337380 sequences. (Running on oeis4.)