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(1/4) * number of ways to select 3 distinct points forming a triangle of unsigned area = n/2 from a square of grid points with side length n.
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%I #9 Oct 26 2018 09:45:33

%S 1,8,23,82,114,416,373,1149,1351,2598,2113,7158,4094,9344,11528,18243,

%T 11882,33006,18603,48760,42102,54312,40061,121728,68115,105204,112546,

%U 178322,101798,284980,133229,300367,247900,305062,295972,625544,271864,475004,479658,847208

%N (1/4) * number of ways to select 3 distinct points forming a triangle of unsigned area = n/2 from a square of grid points with side length n.

%C Permutations of the 3 points are not counted separately.

%H Giovanni Resta, <a href="/A320310/b320310.txt">Table of n, a(n) for n = 1..100</a>

%Y Cf. A115004, A320540, A320542, A320544.

%K nonn

%O 1,2

%A _Hugo Pfoertner_, Oct 23 2018

%E a(35)-a(40) from _Giovanni Resta_, Oct 26 2018