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 A128527 #4 Mar 30 2012 17:21:02 %S A128527 1,1,1,2,6,21,112,853,11117,261080,3181,6903,16029,37762,60698,136522, %T A128527 295370,617884,1031444,2148844,4278884,8230174,13901726,27183550, %U A128527 50879126,92491135,155765543,289049521,515807289,899791226,1498906514,2663076114,4575392562,7727941845,12683646957,21727344375,36188012919,59514326840,96079635752,159569603160 %N A128527 Number of 5-indecomposable (connected) graphs on n nodes. %C A128527 See A124593 for definition. %F A128527 G.f.: x/((1-x)*(1-x^2)^2*(1-x^3)^8*(1-x^4)^44) + 1 - x^3 - 5*x^4 - 37*x^5 + 38*x^6 + 651*x^7 + 10539*x^8 + 259303*x^9 + 548*x^10 + 416*x^11 + 286*x^12. %Y A128527 Cf. A126099, A128526, A128528 %K A128527 nonn %O A128527 1,4 %A A128527 _David Applegate_ and _N. J. A. Sloane_, Mar 07 2007