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 A274758 #9 Jul 06 2016 01:06:45 %S A274758 2,4,9,34,91,66,534,121,134,716,40391,516 %N A274758 Least number whose square is the sum of two positive triangular numbers in exactly n ways. %C A274758 a(13) > 4*10^7, if it exists. - _Giovanni Resta_, Jul 04 2016 %e A274758 a(1) = 2 because 2^2 = 1 + 3. %e A274758 a(2) = 4 because 4^2 = 1 + 15 = 6 + 10. %e A274758 a(3) = 9 because 9^2 = 3 + 78 = 15 + 66 = 36 + 45. %Y A274758 Cf. A000217, A000290, A052346. %K A274758 nonn,more %O A274758 1,1 %A A274758 _Altug Alkan_, Jul 04 2016 %E A274758 a(9)-a(12) from _Giovanni Resta_, Jul 04 2016