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 A121294 #3 Mar 31 2012 10:25:21 %S A121294 1,2,5,8,10,12,17,22,27,30,33,36,43,50,57,64,68,72,76,80,89,98,107, %T A121294 116,125 %N A121294 a(m^2) = m^3; a(m^2+k) = m^3 + km, 0 <= k <= m; a(m(m+1)) = (m+1)m^2; a(m(m+1)+k) = (m+1)m^2 + k(2m+1), 0 <= k <= m+1; a((m+1)^2) = (m+1)^3. %C A121294 A lower bound on A121231(n), the maximal number of 1's in any (0,1)-matrix M such that M^2 is also a (0,1)-matrix. %C A121294 For example, for m^2 x m^2 matrices one can obtain a(m^2) = m^3 using m^2 m x m matrices with one row of m of 1's and (m-1) rows of m of 0's. %K A121294 nonn %O A121294 1,2 %A A121294 _Dan Dima_, Aug 24 2006 %E A121294 Edited by R. J. Mathar, Oct 01 2008