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 A047135 #8 Jan 20 2020 09:07:17 %S A047135 1,4,14,48,151,496,1679,4892,16099,55566,126070,437604,1610354, %T A047135 10586223,37753710,142615460,545804530,2501659594,9822392246, %U A047135 38387432220,149904480000,622664257407,2483093527816,9821396841402 %N A047135 a(n) = T(n,n-3), array T as in A047130. %Y A047135 Cf. A047130. %K A047135 nonn %O A047135 3,2 %A A047135 _Clark Kimberling_ %E A047135 Definition corrected by _Georg Fischer_, Jan 20 2020