1,8

Table of n, a(n) for n=1..15.

Three collinear points in an n X n grid A000938 ; n X n X n grid A157882

Sequence in context: A125907 A025514 A204393 * A289562 A054833 A054212

Adjacent sequences: A178270 A178271 A178272 * A178274 A178275 A178276

nonn

R. H. Hardin, suggested by R. J. Mathar in the Sequence Fans Mailing List, May 24 2010

approved