OFFSET

1,3

COMMENTS

LINKS

Nathaniel Johnston, C program for computing terms

EXAMPLE

a(1) = 0, since there is only one point on a 1 X 1 grid.

a(2) = 1, since the four points on a 2 X 2 grid build a 1 X 1 square.

a(3) = 4 since there are 3 sizes of squares on a 3 X 3 grid -- 1 X 1, 2 X 2, sqrt(2) X sqrt(2) -- and a single nonsquare deltoid.

CROSSREFS

KEYWORD

nonn

AUTHOR

Demacek Ondrej (demacek(AT)gjh.sk), Apr 27 2009

EXTENSIONS

Edited by Ray Chandler, May 01 2011

Corrected and extended by Nathaniel Johnston with help from Ray Chandler, May 11 2011

STATUS

approved