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 A135815 #8 Jul 01 2023 08:27:59
%S A135815 1,1,1,2,6,43,707,26396,2437224,598846437,419417521685,
%T A135815 904349062852310,6075281872200844330,140389254096848971143999,
%U A135815 10843844462460100434065782151,3088707655477705662835120169107312
%N A135815 Row sums of triangle A135814 (number of coincidence-free m-tuple lists of length n).
%F A135815 a(n) = Sum_{m=0..n} A135814(n,m), n>=0.
%Y A135815 Cf. A135816 (alternating row sums of A135814).
%K A135815 nonn,easy
%O A135815 0,4
%A A135815 _Wolfdieter Lang_, Jan 21 2008