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 A060517 #6 May 10 2013 12:44:37
%S A060517 1,1,0,1,1,2,1,1,3,6,6,6,3,1,1,6,15,34,58,60,60,50,33,10,1,1,10,35,
%T A060517 120,265,475,820,1200,1615,1860,1693,1060,425,105,15,1,1,15,75,330,
%U A060517 990,2691,6326,13170,26205,48055,79206,112863,133535,124680,88890,47874
%N A060517 Triangle T(n,k) of series-reduced (or homeomorphically irreducible) graphs with loops on n labeled nodes and with k edges, k=0..binomial(n+1,2).
%D A060517 I. P. Goulden and D. M. Jackson, Combinatorial Enumeration, John Wiley and Sons, N.Y., 1983.
%F A060517 E.g.f.: (1 + x * y)^( - 1/2) * exp( - x * y/2 - x^2 * y^2/4) * Sum_{k=0..inf}(1 + x)^binomial(k + 1, 2) * exp( - x^2 * y * k^2/(2 * (1 + x * y)) + x^2 * y * k/2) * x^k/k!
%e A060517 [1], [1, 0], [1, 1, 2, 1], [1, 3, 6, 6, 6, 3, 1], [1, 6, 15, 34, 58, 60, 60, 50, 33, 10, 1], [1, 10, 35, 120, 265, 475, 820, 1200, 1615, 1860, 1693, 1060, 425, 105, 15, 1], [1, 15, 75, 330, 990, 2691, 6326, 13170, 26205, 48055, 79206, 112863, 133535, 124680, 88890, 47874, 19443, 5925, 1330, 210, 21, 1], ...
%Y A060517 Row sums: A060516, A003514, A060514.
%K A060517 easy,nonn,tabf
%O A060517 0,6
%A A060517 _Vladeta Jovovic_, Mar 24 2001