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 A260041 #11 Jul 23 2015 03:58:55 %S A260041 0,1,9,88,935,10576,125398,1541842,19510569,252692488,3336041258, %T A260041 44754332228,608627917092,8374308526624,116400823021244, %U A260041 1632397871933462,23073139088034053,328412887616247352,4703787284447392654,67751302345297146628,980837632950784897364 %N A260041 Number of twin-tree-rooted maps with n edges. %H A260041 R. C. Mullin, <a href="http://dx.doi.org/10.1016/S0021-9800(67)80001-2">On the average activity of a spanning tree of a rooted map</a>, J. Combin. Theory, 3 (1967), 103-121. %H A260041 R. C. Mullin, <a href="/A260039/a260039.pdf">On the average activity of a spanning tree of a rooted map</a>, J. Combin. Theory, 3 (1967), 103-121. [Annotated scanned copy] %Y A260041 Row sums of A260040. %K A260041 nonn %O A260041 0,3 %A A260041 _N. J. A. Sloane_, Jul 22 2015