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%I #14 Mar 11 2024 10:14:40
%S 1,4,121,144,441,1444,114244,2214144,11142244,121242121,421111441,
%T 1111422244,44424414441,111114222244,11111142222244,214222214414224,
%U 242441124211441,411244411422244,1111111422222244,2111211444222241
%N Squares composed of digits {1,2,4}.
%H Zhao Hui Du, <a href="/A053881/b053881.txt">Table of n, a(n) for n = 1..54</a>
%H Patrick De Geest, <a href="http://www.worldofnumbers.com/threedigits.htm">Squares containing at most three distinct digits, Index entries for related sequences</a>
%F a(n) = A053880(n)^2.
%Y Cf. A053880.
%K nonn,base
%O 1,2
%A _Patrick De Geest_, Mar 15 2000
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