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 A163480 #14 Jan 14 2024 14:20:25 %S A163480 0,1,2,15,16,17,18,19,20,141,142,143,144,145,146,159,160,161,162,163, %T A163480 164,177,178,179,180,181,182,1275,1276,1277,1278,1279,1280,1293,1294, %U A163480 1295,1296,1297,1298,1311,1312,1313,1314,1315,1316,1437,1438,1439 %N A163480 Row 0 of A163334 (column 0 of A163336). %F A163480 a(n) = A163332(A037314(n)). - _Kevin Ryde_, Sep 29 2020 %o A163480 (PARI) a(n) = my(v=digits(n,3),s=Mod(0,2)); for(i=1,#v, if(s,v[i]+=6); s+=v[i]); fromdigits(v,9); \\ _Kevin Ryde_, Sep 29 2020 %Y A163480 Cf. A163481 (Y axis), A037314 (Z-order X axis). %Y A163480 Coordinates: A163528, A163529. %K A163480 nonn %O A163480 0,3 %A A163480 _Antti Karttunen_, Jul 29 2009