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 A273553 #14 Jun 06 2016 00:08:23 %S A273553 0,1,2,4,19,21 %N A273553 Numbers n such that n! is the sum of a square and a nonnegative cube. %C A273553 Numbers n such that n! = x^2 + y^3 where x, y are integers and y >= 0, is soluble. %C A273553 a(7) > 33. - _Giovanni Resta_, Jun 03 2016 %e A273553 4 is a term because 4! = 4^2 + 2^3. %e A273553 19 is a term because 19! = 345427200^2 + 132480^3. %e A273553 21 is a term because 21! = 6389296200^2 + 2173500^3. %Y A273553 Cf. A000142, A022549. %K A273553 nonn,more %O A273553 1,3 %A A273553 _Altug Alkan_, May 25 2016