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 A054150 #14 Jan 24 2022 03:56:14 %S A054150 1,1,2,4,7,13,22,40,73,132,245,458,864,1638,3123,5979,11484,22140, %T A054150 42773,82865,160809,312659,608857,1187323,2318344,4531879,8867913, %U A054150 17369053,34048772,66799240,131146379,257651913,506503984,996288321 %N A054150 Number of positive integers <= 2^n of the form x^2 + 5*y^2. %H A054150 <a href="/index/Qua#quadpop">Index entries for sequences related to populations of quadratic forms</a> %Y A054150 Cf. A020669. %K A054150 nonn %O A054150 0,3 %A A054150 _David W. Wilson_