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 A128528 #4 Mar 30 2012 17:21:02 %S A128528 1,1,1,2,6,21,112,853,11117,261080,11716571,1006700565,164159,422662, %T A128528 1295037,4272969,12780650,23303620,64379033,189490870,556338383, %U A128528 1448500351,2871171041,7624849834,20914847051,55714746424,133364472272,277569288280,708402263349,1827946074290,4530654263579,10312511072061,22005420425661,54057174050076,132409684714581 %N A128528 Number of 6-indecomposable (connected) graphs on n nodes. %C A128528 See A124593 for definition. %F A128528 G.f.: x/((1-x)*(1-x^2)^2*(1-x^3)^8*(1-x^4)^44*(1-x^5)^333) + 1 - x^3 - 5*x^4 - 37*x^5 - 295*x^6 + 318*x^7 + 9540*x^8 + 255640*x^9 + 11694624*x^10 + 1006613825*x^11 + 25539*x^12 + 25593*x^13 + 30877*x^14 + 34220*x^15 %Y A128528 Cf. A126099, A128526, A128527 %K A128528 nonn %O A128528 1,4 %A A128528 _David Applegate_ and _N. J. A. Sloane_, Mar 07 2007