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 A135271 #9 Oct 09 2013 02:24:36 %S A135271 128,448,672,560,280,84,14,1 %N A135271 Row 7 of A038207. %C A135271 A hepteract is a seven-dimensional hypercube with 128 vertices, 448 edges, 672 square faces, 560 cubic cells, 280 tesseract 4-faces, 84 penteract 5-faces and 14 hexeract 6-faces. %H A135271 Wikipedia, <a href="http://en.wikipedia.org/wiki/Hepteract">Hepteract</a>. %p A135271 for i from 7 to 7 do seq(binomial(i, j)*2^(i-j), j = 0 .. i-1) od;# %o A135271 (PARI) Vec((x+2)^7+O(x^8)) \\ _Joerg Arndt_, Apr 15 2013 %Y A135271 Cf. A038207. %K A135271 easy,fini,nonn,full %O A135271 0,1 %A A135271 _Zerinvary Lajos_, Dec 02 2007