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 A256974 #3 Apr 22 2015 18:41:21 %S A256974 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,10,0,17,0, %T A256974 -34,0,9,-2,32,23,8,-12,-8,3,-4,-2,-12,-27,0,17,-8,7,26,0,-27,-7,5, %U A256974 -19,8,-26,31,22,-62,-4,27,0,1,4,48 %N A256974 A254077(n)-A255582(n). %C A256974 Although the sequences have very similar definitions, A254077 is a mystery while A255582 is easily shown to be a permutation of the natural numbers. %Y A256974 Cf. A098550, A254077, A255582. %K A256974 sign %O A256974 0,29 %A A256974 _N. J. A. Sloane_, Apr 22 2015