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 A027260 #10 Aug 04 2025 15:01:45
%S A027260 24,232,2136,19282,172316,1531362,13566288,119972214,1059985776,
%T A027260 9361450868,82670528056,730149455646,6450340708168,57003101680376,
%U A027260 503941824270112,4456975487538614,39435161261004840,349069538338480040,3091176867811031656,27385210981926235494
%N A027260 a(n) = Sum_{k=0..2n-3} T(n,k) * T(n,k+3), with T given by A025177.
%Y A027260 Cf. A025177.
%K A027260 nonn
%O A027260 3,1
%A A027260 _Clark Kimberling_
%E A027260 More terms from _Sean A. Irvine_, Oct 26 2019