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A190313 Number of scalene triangles, distinct up to congruence, on a (n X n)-grid (or geoboard). 3
0, 0, 3, 18, 57, 137, 280, 517, 863, 1368, 2069, 3007, 4218, 5774, 7704, 10109, 13025, 16523, 20671, 25567, 31274, 37891, 45529, 54213, 64082, 75320, 87901, 102014, 117736, 135217, 154606, 176024, 199502, 225290, 253485, 284305, 317811, 354282, 393618, 436202, 482332 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Table of n, a(n) for n=1..41.

Barile, Margherita: MathWorld -- Geoboard.

Weisstein, Eric W.: MathWorld -- Scalene Triangle.

FORMULA

a(n) = A028419(n)-A189978(n).

CROSSREFS

Cf. A028419, A189978.

Sequence in context: A222204 A027289 A061317 * A139362 A012763 A006011

Adjacent sequences:  A190310 A190311 A190312 * A190314 A190315 A190316

KEYWORD

nonn

AUTHOR

Martin Renner, May 08 2011

STATUS

approved

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Last modified November 19 08:53 EST 2018. Contains 317347 sequences. (Running on oeis4.)