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 A018929 #22 Dec 14 2018 20:01:28
%S A018929 9,25,169,7225,24649,151905625,155276521,11296501225,76364348281,
%T A018929 115402204681,107410609760281,297167295808681,3750076824489457081,
%U A018929 2635366822165468321225,17815079717838565851481,761621011605820344834025
%N A018929 Define {b(n)} by b(1) = 3, b(n) (n >= 2) is smallest number such that b(1)^2 + ... + b(n)^2 = m^2 for some m and all b(i) are distinct. Sequence gives values of m^2.
%F A018929 a(n) = A018928(n+1)^2 - A018930(n+1)^2. - _César Aguilera_, Nov 02 2018
%Y A018929 Cf. A018928, A018930.
%K A018929 nonn
%O A018929 1,1
%A A018929 Charles Reed (charles.reed(AT)bbs.ewgateway.org)
%E A018929 More terms from _David W. Wilson_