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 A054151 #11 Jan 24 2022 03:57:12 %S A054151 1,1,2,4,7,12,21,39,69,130,240,451,854,1620,3101,5941,11443,22080, %T A054151 42724,82835,160914,313149,610230,1190802,2326448,4550161,8908095, %U A054151 17455391,34232368,67184426,131949378,259313689,509925468,1003302084 %N A054151 Number of positive integers <= 2^n of form x^2 + 7 y^2. %H A054151 <a href="/index/Qua#quadpop">Index entries for sequences related to populations of quadratic forms</a> %Y A054151 Cf. A020670. %K A054151 nonn %O A054151 0,3 %A A054151 _David W. Wilson_