Table of n, a(n) for n=1..11.
Three collinear points in an n X n grid A000938 ; n X n X n grid A157882
Sequence in context: A234060 A115946 A082176 * A101701 A092011 A216900
Adjacent sequences: A178282 A178283 A178284 * A178286 A178287 A178288
R. H. Hardin, suggested by R. J. Mathar in the Sequence Fans Mailing List, May 24 2010