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 A054153 #11 Jan 24 2022 03:56:57 %S A054153 1,1,2,2,6,8,18,30,57,103,194,360,682,1292,2464,4721,9078,17481,33808, %T A054153 65485,127116,247179,481426,938950,1833572,3584679,7015237,13741715, %U A054153 26940645,52858250,103785060,203913141,400891200,788601863,1552114600 %N A054153 Number of positive integers <= 2^n of form x^2 + 9 y^2. %H A054153 <a href="/index/Qua#quadpop">Index entries for sequences related to populations of quadratic forms</a> %Y A054153 Cf. A020672. %K A054153 nonn %O A054153 0,3 %A A054153 _David W. Wilson_