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 A054101 #6 Jun 26 2025 12:08:01 %S A054101 1,3,3,11,33,145,747,4607,32873,266969,2431611,24554191,272289633, %T A054101 3289836257,43017800315,605289111695,9119314568457,146474344313977, %U A054101 2498617856687403 %N A054101 T(n,n-1), array T as in A054098. %Y A054101 Cf. A054098. %K A054101 nonn %O A054101 1,2 %A A054101 _Clark Kimberling_