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 A249059 #7 Oct 27 2014 23:56:57 %S A249059 1,5,10,40,110,430,1420,5720,21340,89980,367400,1627120,7138120, %T A249059 33172040,154520080,751616800,3687498320,18719834320,96157299040, %U A249059 507993654080,2719611532000,14911459229920,82901747529920,470599687507840,2708946870815680 %N A249059 Row sums of the triangular array at A249057. %H A249059 Clark Kimberling, <a href="/A249059/b249059.txt">Table of n, a(n) for n = 0..100</a> %e A249059 First 3 rows from A249057: %e A249059 1 %e A249059 4 1 %e A249059 5 4 1, %e A249059 so that a(0) = 1, a(1) = 5, a(2) = 10. %t A249059 z = 30; p[x_, n_] := x + (n + 2)/p[x, n - 1]; p[x_, 1] = 1; %t A249059 t = Table[Factor[p[x, n]], {n, 1, z}]; %t A249059 u = Numerator[t]; %t A249059 v1 = Flatten[CoefficientList[u, x]]; (* A249057 *) %t A249059 v2 = u /. x -> 1 (* A249059 *) %t A249059 v3 = u /. x -> 0 (* A249060 *) %Y A249059 Cf. A249057, A249060. %K A249059 nonn,easy %O A249059 0,2 %A A249059 _Clark Kimberling_, Oct 20 2014