1,3
R. H. Hardin, 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: A093216 A272555 A121888 * A237337 A230030 A206116
Adjacent sequences: A178289 A178290 A178291 * A178293 A178294 A178295
nonn
R. H. Hardin, suggested by R. J. Mathar in the Sequence Fans Mailing List, May 24 2010
approved