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 A273546 #22 Jun 08 2016 00:08:45 %S A273546 0,1,4,6,8,9,12,13,14,18,24,25 %N A273546 Integers n such that n^n is the average of a nonzero square and a positive cube. %C A273546 Integers n such that n^n = (x^2 + y^3)/2 where x, y > 0, is soluble. %e A273546 13 is a term because 13^13 = (24134045^2 + 28561^3)/2. %o A273546 (PARI) isA055394(n)=for(k=1, sqrtnint(n-1, 3), if(issquare(n-k^3), return(1))); 0 %o A273546 is(n)=isA055394(2*n^n) \\ _Charles R Greathouse IV_, Jun 08 2016 %Y A273546 Cf. A000312, A055394, A267415. %K A273546 nonn,more %O A273546 1,3 %A A273546 _Altug Alkan_, May 26 2016 %E A273546 a(10)-a(12) from _Giovanni Resta_, May 26 2016