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 A128526 #4 Mar 30 2012 17:21:02 %S A128526 1,1,1,2,6,21,112,853,111,181,323,437,717,1198,1606,2454,3782,4997, %T A128526 7245,10543,13711,19092,26612,34076,45948,61930,78154,102654,134670, %U A128526 167688,215496,276480,340080,429030,540246,657162,815994,1011264,1217712,1491336,1822920,2174898,2631618,3178230,3760086,4501332,5378868,6314748,7487964,8863635 %N A128526 Number of 4-indecomposable (connected) graphs on n nodes. %C A128526 See A124593 for definition. %F A128526 G.f.: x/((1-x)*(1-x^2)^2*(1-x^3)^8) + 1 - x^3 - 5*x^4 + 7*x^5 + 82*x^6 + 783*x^7 + 17*x^8 + 10*x^9. %Y A128526 Cf. A126099, A128527, A128528 %K A128526 nonn %O A128526 1,4 %A A128526 _David Applegate_ and _N. J. A. Sloane_, Mar 07 2007