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 A027128 #9 Jun 14 2025 19:52:11 %S A027128 1,2,7,24,81,274,927,3132,10552,35395,118065,391320,1288260,4212091, %T A027128 13679558,44141377,141571286,451475589,1432198967,4521270066, %U A027128 14209424215,44474645476,138681426899,430955113144,1334997086607 %N A027128 a(n) = A027113(n, 2n-10). %Y A027128 Cf. A027113. %K A027128 nonn %O A027128 5,2 %A A027128 _Clark Kimberling_