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 A027132 #4 Mar 30 2012 18:56:14 %S A027132 1,2,4,12,27,70,182,477,1269,3413,9249,25255,69389,191680,532026, %T A027132 1482926,4148949,11647260,32797042,92608175,262157690,743845685, %U A027132 2115093984,6026041793,17199956143,49176678286,140824260498,403865784020 %N A027132 a(n) = diagonal sum of right justified array T given by A027113. %K A027132 nonn %O A027132 0,2 %A A027132 _Clark Kimberling_