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 A016842 #8 Jul 08 2025 05:56:21 %S A016842 729,117649,1771561,11390625,47045881,148035889,387420489,887503681, %T A016842 1838265625,3518743761,6321363049,10779215329,17596287801,27680640625, %U A016842 42180533641,62523502209,90458382169 %N A016842 (4n+3)^6. %H A016842 <a href="/index/Rec#order_07">Index entries for linear recurrences with constant coefficients</a>, signature (7, -21, 35, -35, 21, -7, 1). %K A016842 nonn,easy %O A016842 0,1 %A A016842 _N. J. A. Sloane_