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 A175374 #4 Jun 26 2025 12:14:16 %S A175374 1,5,9,9,13,21,25,25,25,29,45,45,45,49,49,49,53,69,69,77,77,77,77,81, %T A175374 81,85,101,109,109,109,117,117,117,117,117,117,125,141,149,149,157, %U A175374 157,157,157,165,165,165,165,165,169,193,197,205,205,205,205,213,213,213,213 %N A175374 a(n) = A175373(n^2). %C A175374 Number of integer pairs (x,y) satisfying x^4+y^4 <= n^2, any -n <= x,y <=n. %Y A175374 Cf. A175364, A175373. %K A175374 nonn %O A175374 0,2 %A A175374 _R. J. Mathar_, Apr 24 2010