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 A162341 #5 Mar 11 2014 01:34:15 %S A162341 1,1,3,1,4,2,4,2,4,4,5,3,6,2,4,4,7,3,5,4,4,3,6,4,8,5,4,2,4,2,10,8,6,3, %T A162341 7,5,5,5,6,4,7,3,7,5,4,2,8,11,9,2,4,4,5,5,9,5,7,3,5,4,4,5,13,8,4,2,10, %U A162341 9,9,5,4,4,8,6,7,4,6,6,7,5,10,5,7,5,5,4,6,6,7,2,4,7,11,5,7,5,6,8,8,9,13,7,9 %N A162341 a(n) = number of grid points P(x,y) that are covered by a polyedge as the graph of the "mountain path" function for prime numbers, where x=n and y=0..oo. %C A162341 Se also A162340. %H A162341 Omar E. Pol, <a href="http://www.polprimos.com/imagenespub/polmpfpn.jpg">Graph of the mountain path function for prime numbers</a> %F A162341 a(n) = A052288(n-2) + (-1)^n for n>=3. [From _Nathaniel Johnston_, Nov 06 2010] %Y A162341 Cf. A000040, A006005, A008578, A162200, A162201, A162202, A162203, A162340. %K A162341 nonn %O A162341 0,3 %A A162341 _Omar E. Pol_, Jul 01 2009 %E A162341 Edited by _Omar E. Pol_, Jul 05 2009 %E A162341 More terms from _Nathaniel Johnston_, Nov 06 2010