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%I #26 Jul 21 2021 09:09:45
%S 3,21,186,705,2196,5046,10212,19149,31524,50049,77100,114633,159453,
%T 225978,298833,390069,508137,663426,824868,1040727,1258833,1532565,
%U 1859331,2254938,2628309,3130227,3664920,4261503,4917939,5742696,6503331,7511280,8507322,9658806,10855989,12237066
%N Number of polygon edges formed by infinite lines when connecting all vertices and all points that divide the sides of an equilateral triangle into n equal parts.
%C See A344279 for images of the polygons.
%F a(n) = A344279(n) + A344657(n) - 1.
%Y Cf. A344279 (number of polygons), A344657 (number of vertices), A346446 (number of k-gons), A092867 (number polygons inside the triangle), A344899, A345650.
%K nonn
%O 1,1
%A _Scott R. Shannon_, Jun 24 2021
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