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 A047146 #6 Sep 05 2025 13:38:48 %S A047146 1,1,2,15,62,180,566,2419,9780,34958,125068,491958,1943862,7377378, %T A047146 27781250,107932937,422922350,1637252968,6306134498,24545899232, %U A047146 96073204466,374915623580,1459739914638,5704537068510,22360905044350 %N A047146 T(n,n+1), array T as in A047140. %Y A047146 Cf. A047140. %K A047146 nonn,changed %O A047146 0,3 %A A047146 _Clark Kimberling_