This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A169999 #11 Jun 17 2019 15:22:16 %S A169999 0,1,1,9,16,13,9,13,16,81,100,91,144,142,157,117,112,133,81,91,100, %T A169999 117,133,112,144,157,142,729,784,757,900,961,931,819,877,853,1296, %U A169999 1369,1333,1278,1249,1237,1413,1381,1456,1053,1117,1099,1008,997,1030,1197,1183,1141 %N A169999 Carryless product n X n in base 3. %H A169999 Antti Karttunen, <a href="/A169999/b169999.txt">Table of n, a(n) for n = 0..19682</a> %H A169999 David Applegate, Marc LeBrun and N. J. A. Sloane, <a href="http://neilsloane.com/doc/carry1.pdf">Carryless Arithmetic (I): The Mod 10 Version</a> %H A169999 <a href="/index/Ca#CARRYLESS">Index entries for sequences related to carryless arithmetic</a> %o A169999 (PARI) %o A169999 A325820sq(b, c) = fromdigits(Vec(Pol(digits(b,3))*Pol(digits(c,3)))%3, 3); %o A169999 A169999(n) = A325820sq(n,n); \\ _Antti Karttunen_, Jun 17 2019 %Y A169999 Main diagonal of A325820. %Y A169999 For bases 2 through 10 see A000695, A169999, A170985-A170990 and A059729. %K A169999 nonn,base,look %O A169999 0,4 %A A169999 _N. J. A. Sloane_, Aug 29 2010