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 A065943 #5 Mar 30 2012 16:49:17
%S A065943 3,6,30,10,90,315,15,210,1260,3780,21,420,3780,18900,51975,28,756,
%T A065943 9450,69300,311850,810810,36,1260,20790,207900,1351350,5675670,
%U A065943 14189175,45,1980,41580,540540,4729725,28378350,113513400,275675400
%N A065943 Triangle of coefficients of Bessel polynomials {y_n(x)}''.
%D A065943 J. Riordan, Combinatorial Identities, Wiley, 1968, p. 77.
%H A065943 <a href="/index/Be#Bessel">Index entries for sequences related to Bessel functions or polynomials</a>
%e A065943 For n = 2 .. 5 the polynomials are 6; 30+90*x; 90+630*x+1260*x^2; 210+2520*x+11340*x^2+18900*x^3.
%Y A065943 Cf. A001497, A001498, A065931.
%K A065943 nonn
%O A065943 2,1
%A A065943 _N. J. A. Sloane_, Dec 08 2001