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 A069912 #13 Sep 01 2016 06:58:35 %S A069912 0,0,0,0,1,2,3,4,6,8,0,0,0,0,1,3,4,5,8,10,0,0,0,1,2,4,5,7,9,12,0,0,2, %T A069912 2,4,6,7,9,12,15,1,1,2,3,5,8,10,12,15,18,2,3,4,5,7,10,12,14,17,20,3,4, %U A069912 5,6,9,12,14,16,20,23,4,6,7,9,11,14,16,19,23,27,6,7,9,10,14,17,19,22,26,30 %N A069912 a(n) = A067552(n)/9 where A067552(n) = SumOfDigits(n)^2 - SumOfDigits(n^2), with SumOfDigits = A007953. %H A069912 Ivan Neretin, <a href="/A069912/b069912.txt">Table of n, a(n) for n = 0..10000</a> %o A069912 (PARI) a(n) = (sumdigits(n)^2 - sumdigits(n^2))/9; \\ _Michel Marcus_, Sep 01 2016 %K A069912 nonn,base %O A069912 0,6 %A A069912 _Vladeta Jovovic_, May 04 2002 %E A069912 Offset changed to 0 for compatibility with A067552 by _Ivan Neretin_, Sep 01 2016