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 A247763 #23 Nov 30 2014 14:06:11 %S A247763 1,1,1,1,1,0,1,2,1,0,0,1,0,1,1,1,4,0,0,1,1,0,1,1,0,0,0,1,0,0,0,2,2,1, %T A247763 1,1,0,0,0,0,2,0,0,0,1,0,1,2,1,0,0,0,0,0,0,1,1,0,0,1,0,1,1,1,2,0,0,4, %U A247763 0,0,0,0,1,0,0,0,1,0,1,2,0,0,0,1 %N A247763 The number of representations of n as n=x^2-2^y, x>0, y>=0. %C A247763 The n for which the count is nonzero are listed in A051204. %H A247763 R. J. Mathar, <a href="/A247763/b247763.txt">Table of n, a(n) for n = 1..136</a> %H A247763 Maohua Le, <a href="https://eudml.org/doc/206430">On the number of solutions of the generalized Ramanujan-Nagell equation x^2-d=2^(n+2)</a>, Acta Arithm. 60 (1991) 149. %H A247763 R. J. Mathar, <a href="/A247763/a247763.pdf">The number of representations of n of the form n=x^2-2^y</a> [PDF] %H A247763 Nicholas Tzanakis, <a href="http://dx.doi.org/10.1016/0022-314X(83)90016-1">On the diophantine equation y^2-d=2^k</a>, J. Number Theory 17 (1983) 144. %Y A247763 Cf. A051205. %K A247763 nonn %O A247763 1,8 %A A247763 _R. J. Mathar_, Oct 19 2014