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A181947 Number of rhombi, distinct up to congruence, on an (n X n)-grid (or geoboard). 0
0, 1, 3, 6, 11, 16 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Table of n, a(n) for n=1..6.

Weisstein, Eric W.: MathWorld -- Rhombus.

CROSSREFS

Cf. A181944, A189418.

Sequence in context: A256001 A131665 A132158 * A310101 A310102 A310103

Adjacent sequences:  A181944 A181945 A181946 * A181948 A181949 A181950

KEYWORD

nonn

AUTHOR

Martin Renner, Apr 03 2012

STATUS

approved

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Last modified November 16 02:33 EST 2018. Contains 317252 sequences. (Running on oeis4.)