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 A135816 #8 Jul 01 2023 08:28:02
%S A135816 1,-1,1,-2,2,9,231,-208,-903776,-143213213,118835487821,
%T A135816 388585756132242,-521157743571990450,-72978076847525420725075,
%U A135816 -1904341683955074815027626877,1483881447421749524769255709488292,1360468742213189927760243663613128043340
%N A135816 Alternating row sums of triangle A135814 (number of coincidence-free m-tuple lists of length n).
%F A135816 a(n) = Sum_{m=0..n} A135814(n,m)*(-1)^m, n>=0.
%Y A135816 Cf. A135815 (row sums of A135814).
%K A135816 sign,easy
%O A135816 0,4
%A A135816 _Wolfdieter Lang_, Jan 21 2008