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 A054137 #6 Apr 02 2024 11:17:45 %S A054137 2,8,31,97,264,654,1518,3366,7227,15169,31339,64043,129906,262192, %T A054137 527444,1058764,2122373,4250731,8508777,17026409,34063444,68139538, %U A054137 136294026,272605602,545231679,1090487109,2181001623 %N A054137 T(n,3), array T as in A054134. %H A054137 <a href="/index/Rec#order_06">Index entries for linear recurrences with constant coefficients</a>, signature (7, -20, 30, -25, 11, -2). %K A054137 nonn %O A054137 3,1 %A A054137 _Clark Kimberling_