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 A115134 #2 Oct 12 2012 14:40:25 %S A115134 10,30,95,311,1043,3564,12363,43420,154088,551684,1990326,7228417, %T A115134 26405725,96961560,357688755,1324982160,4926502020,18379785300, %U A115134 68783559810,258141170430,971310800694,3663524817768,13848466284350 %N A115134 Third diagonal sequence of triangle A115127. %F A115134 G.f. -(1+x^2+4*x^3) + (1-x+x^3)*c(x) with the g.f. c(x):=(1-sqrt(1-4*x))/(2*x) of A000108 (Catalan). %Y A115134 Cf. A071726 (second diagonal of A115127 for n>=3 with g.f. -(1+x+3*x^2)+(1+x^2)*c(x)). %K A115134 nonn,easy %O A115134 4,1 %A A115134 _Wolfdieter Lang_, Jan 13 2006