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 A054141 #6 Dec 30 2023 21:44:33 %S A054141 2,6,31,180,1101,6901,43828,280664,1807909,11698479,75973701, %T A054141 494890116,3231949644,21153128028,138712184488 %N A054141 T(2n-1,n), array T as in A054134. %Y A054141 Cf. A054134. %K A054141 nonn %O A054141 1,1 %A A054141 _Clark Kimberling_