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A061144
Sum of the areas of triangles whose vertices lie on the n X n grid with unit spacing as enumerated in A045996.
1
0, 2, 70, 764, 4718, 20658, 71616, 209752, 540416, 1259050, 2704494, 5433420, 10320054, 18688026, 32478032, 54460064, 88495536, 139857842, 215617062, 325102172, 480442174, 697204602, 995133456, 1399002496, 1939589056
OFFSET
1,2
EXAMPLE
a(2)=4*(1/2)=2 and a(3)=32*(1/2)+32*(1)+4*(3/2)+8*(2)=70.
CROSSREFS
Cf. A045996.
Sequence in context: A085915 A285217 A259317 * A132566 A151686 A201555
KEYWORD
nonn
AUTHOR
Zachary Franco, Apr 15 2001
EXTENSIONS
a(14)-a(25) and corrected offset from Nathaniel Johnston, Apr 29 2011
STATUS
approved