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Table of n, a(n) for n=1..20.
P. De Geest, Squares containing at most three distinct digits, Index entries for related sequences
Sequence in context: A286757 A239187 A062081 * A075114 A017186 A098839
Adjacent sequences: A053878 A053879 A053880 * A053882 A053883 A053884
Patrick De Geest, Mar 15 2000.