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 A072755 #4 Mar 30 2012 17:36:39 %S A072755 1,4,17,140,2257,40766,206087,246853,452940,699793,1152733,8768924, %T A072755 9921657,18690581,122065143,262820867,2487452946,144535091735, %U A072755 147022544681,585602725778,2489433447793,5564469621364,13618372690521 %N A072755 Denominators of continued fraction convergents to Copeland-Erdos constant. %o A072755 (PARI) for(n=1,30, v=vector(n,i, A030168[i]); print1(contfracpnqn(v)[2,1],",")) %Y A072755 Cf. A072754 (numerators), A030168 (continued fraction), A033308 (decimal expansion). %K A072755 frac,nonn %O A072755 0,2 %A A072755 _Rick L. Shepherd_, Jul 09 2002