A334713 - cp's OEIS frontend

A334713 Number of ways to select four points from an n X n grid so that three of them form a triangle of nonzero area and the extra point is on one of the edges of the triangle.

%I A334713 #28 Jan 02 2024 12:45:49
%S A334713 0,0,48,532,3088,11340,35264,88088,198912,407744,783344,1388196,
%T A334713 2392592,3889292,6124032,9394536,14058816,20345400,29034288,40356156,
%U A334713 55487952,75207892,100445632,131773104,171900864,221418336,282240816,356468556,447353616,555069252,686394560,840316880,1023123264,1238261952
%N A334713 Number of ways to select four points from an n X n grid so that three of them form a triangle of nonzero area and the extra point is on one of the edges of the triangle.
%C A334713 Computed by _Tom Duff_, Jun 15 2020 - Jun 22 2020
%H A334713 Tom Duff, <a href="/A334713/b334713.txt">Table of n, a(n) for n = 1..192</a>
%H A334713 Tom Duff, <a href="/A334708/a334708_3.txt">Data for tables A334708, A334709, A334710, A334711 for grids of size up to 192 X 192</a>
%Y A334713 The main diagonal of A334710.
%K A334713 nonn
%O A334713 1,3
%A A334713 _N. J. A. Sloane_, Jun 15 2020

cp's OEIS Frontend

A334713 Number of ways to select four points from an n X n grid so that three of them form a triangle of nonzero area and the extra point is on one of the edges of the triangle.