cp's OEIS Frontend

A358409 Number of edges formed in a square by straight line segments when connecting the n-1 points between each corner that divide each edge into n equal parts to the n-1 points on each of the two adjacent edges of the square.

%I A358409 #8 Nov 16 2022 08:53:27
%S A358409 4,12,68,316,1020,2524,5420,10348,18044,29244,45940,66188,97796,
%T A358409 135772,182532,240932,321612,405852,525184,646088,796388,974740,
%U A358409 1199244,1407140,1700944,2004576,2356296,2729256,3221296,3630296,4272656,4835984,5522768,6269016,7084056,7835068,8987192,10005400
%N A358409 Number of edges formed in a square by straight line segments when connecting the n-1 points between each corner that divide each edge into n equal parts to the n-1 points on each of the two adjacent edges of the square.
%C A358409 See A358407 and A358408 for images of the square.
%F A358409 a(n) = A358407(n) + A358408(n) - 1 by Euler's formula.
%Y A358409 Cf. A358407 (regions), A358408 (vertices), A355800, A331448.
%K A358409 nonn
%O A358409 1,1
%A A358409 _Scott R. Shannon_, Nov 14 2022