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 A139111 #3 Mar 30 2012 17:39:33 %S A139111 2,18,1198,76718,4909998,1256959738,1287126772718,82376113453998, %T A139111 337412560707579838,86377615541140438718,5528167394632988078010, %U A139111 5660843412104179791883246,92747258463914881710215118590 %N A139111 Bisection of A139104. %Y A139111 Cf. A139104. %K A139111 nonn %O A139111 1,1 %A A139111 _Omar E. Pol_, Apr 08 2008 %E A139111 More terms from _R. J. Mathar_, May 22 2008