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A320310 (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. 2
1, 8, 23, 82, 114, 416, 373, 1149, 1351, 2598, 2113, 7158, 4094, 9344, 11528, 18243, 11882, 33006, 18603, 48760, 42102, 54312, 40061, 121728, 68115, 105204, 112546, 178322, 101798, 284980, 133229, 300367, 247900, 305062, 295972, 625544, 271864, 475004, 479658, 847208 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Permutations of the 3 points are not counted separately.

LINKS

Giovanni Resta, Table of n, a(n) for n = 1..100

CROSSREFS

Cf. A115004, A320540, A320542, A320544.

Sequence in context: A099274 A208633 A036562 * A303720 A304414 A305949

Adjacent sequences:  A320307 A320308 A320309 * A320311 A320312 A320313

KEYWORD

nonn

AUTHOR

Hugo Pfoertner, Oct 23 2018

EXTENSIONS

a(35)-a(40) from Giovanni Resta, Oct 26 2018

STATUS

approved

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Last modified September 16 15:50 EDT 2021. Contains 347472 sequences. (Running on oeis4.)