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 A054159 #11 Jan 24 2022 03:57:03 %S A054159 0,1,1,2,4,8,15,27,51,93,174,329,620,1177,2250,4308,8286,15961,30871, %T A054159 59792,116083,225754,439666,857554,1674630,3273944,6407147,12550615, %U A054159 24605525,48277287,94790704,186242926,366153007,720274117,1417640576 %N A054159 Number of positive integers <= 2^n of form 2 x^2 + 9 y^2. %H A054159 <a href="/index/Qua#quadpop">Index entries for sequences related to populations of quadratic forms</a> %Y A054159 Cf. A020676. %K A054159 nonn %O A054159 0,4 %A A054159 _David W. Wilson_