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 A054138 #6 Apr 02 2024 11:18:38 %S A054138 2,10,48,180,570,1602,4128,9972,22947,50899,109806,231988,482540, %T A054138 992212,2023184,4100632,8275877,16652701,33439998,67057096,134344422, %U A054138 268984854,538346448,1077167916,2154929607,4310595495 %N A054138 T(n,4), array T as in A054134. %H A054138 <a href="/index/Rec#order_08">Index entries for linear recurrences with constant coefficients</a>, signature (9, -35, 77, -105, 91, -49, 15, -2). %K A054138 nonn %O A054138 4,1 %A A054138 _Clark Kimberling_