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 A101949 #4 Mar 31 2012 14:39:53 %S A101949 0,0,0,1,-1,1,-1,0,1,-1,1,0,-1,0,0,0,-1,1,0,-1,1,-1,0,3,0,-1,1,-1,0,3, %T A101949 -1,1,-1,3,-1,0,0,-1,0,0,-1,3,-1,1,-1,0,0,0,-1,0,1,-1,3,0,0,0,-1,1,0, %U A101949 -1,0,3,0,-3,0,3,-1,1,-3,0,0 %N A101949 Peak-trough transform of the prime-gap sequence (A001223). %C A101949 The peak-trough transform is defined in A101941 %e A101949 a(4)=1 because A101949(4) is greater than one nearest neighbor on both sides, i.e. A101949(3) and A101949(5), but no more than one. %Y A101949 Cf. A001223, A101941. %K A101949 sign %O A101949 1,24 %A A101949 _Neil Fernandez_, Dec 22 2004