A061144 Sum of the areas of triangles whose vertices lie on the n X n grid with unit spacing as enumerated in A045996.

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

Links

Table of n, a(n) for n=1..25.

Nathaniel Johnston, C program for computing terms

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

Adjacent sequences: A061141 A061142 A061143 * A061145 A061146 A061147

Keyword

nonn

Author

Zachary Franco, Apr 15 2001

Extensions

a(14)-a(25) and corrected offset from Nathaniel Johnston, Apr 29 2011

Status

approved