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 A047132 #7 Jan 20 2020 07:57:27 %S A047132 1,1,2,5,28,84,272,911,3885,14049,50891,185464,735146,2794719, %T A047132 10565837,39940553,155711860,601589056,2317413464,8920255482, %U A047132 34742183340,135196049411,525683426601,2043377119966,7980296279061 %N A047132 T(n,n), array T as in A047130. %K A047132 nonn %O A047132 0,3 %A A047132 _Clark Kimberling_ %E A047132 Definition corrected by _Georg Fischer_, Jan 20 2020