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%I #24 Jan 28 2023 12:05:07
%S 1,6,21,56,131,281,556,1046,1896,3346,5796,9916,16806,28316,47506
%N a(n) is the total number of pentagrams in a variant of pentagram fractal after n iterations.
%C 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.
%H Kival Ngaokrajang, <a href="/A256571/a256571.pdf">Illustration of initial terms</a>
%Y Cf. A255870, A256429, A256569.
%K nonn,more
%O 1,2
%A _Kival Ngaokrajang_, Apr 02 2015
%E a(9) corrected and a(10)-a(15) added by _Udo Vieth_, Jan 16 2023
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