Table of n, a(n) for n=1..8.
P. De Geest, Squares containing at most three distinct digits, Index entries for related sequences
H. Mishima Squares consisted of 3 different digits [From Max Alekseyev, Mar 10 2009]
Sequence in context: A074160 A137074 A137106 * A111771 A052001 A275029
Adjacent sequences: A053959 A053960 A053961 * A053963 A053964 A053965
Patrick De Geest, Mar 15 2000
Two more terms from Mishima's page added by Max Alekseyev, Mar 10 2009