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 A264609 #3 Nov 24 2015 19:41:43 %S A264609 -2,-6,4,-54,28,132,124,-4470,444,5964,2044,89028,8188,248172,9784, %T A264609 -30229110,131068,7314348,524284,361466316,174136,354424812,8388604, %U A264609 54096506052,16344060,12926541804,46427196,1198466847468,536870908,216322653432 %N A264609 A260685(4n). %Y A264609 Cf. A260685. %K A264609 sign %O A264609 1,1 %A A264609 _N. J. A. Sloane_, Nov 24 2015