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 A243476 #7 Feb 09 2015 10:33:52
%S A243476 10,216,2765,27214,227847,1708700,11832896,77170252,480381209,
%T A243476 2881934792,16782041642,95373448420,531211249132,2909490548577,
%U A243476 15712454516343,83849134367589,442957532385072,2319975180476948,12061609189508662,62313958408668146,320192732763382270
%N A243476 Number of isoscent sequences of length n with exactly three descents.
%H A243476 Joerg Arndt and Alois P. Heinz, <a href="/A243476/b243476.txt">Table of n, a(n) for n = 7..100</a>
%t A243476 b[n_, i_, t_] := b[n, i, t] = If[n < 1, 1, Expand[Sum[ If[j < i, x, 1] *b[n - 1, j, t + If[j == i, 1, 0]], {j, 0, t + 1}]]] ; a[n_] := Coefficient[b[n - 1, 0, 0], x, 3]; Table[a[n], {n, 7, 40}] (* _Jean-François Alcover_, Feb 09 2015, after A242352 *)
%Y A243476 Column k=3 of A242352.
%K A243476 nonn
%O A243476 7,1
%A A243476 _Joerg Arndt_ and _Alois P. Heinz_, Jun 05 2014