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 A017355 #17 Jul 08 2025 06:04:06
%S A017355 343,4913,19683,50653,103823,185193,300763,456533,658503,912673,
%T A017355 1225043,1601613,2048383,2571353,3176523,3869893,4657463,5545233,
%U A017355 6539203,7645373,8869743,10218313,11697083
%N A017355 a(n) = (10*n + 7)^3.
%H A017355 Vincenzo Librandi, <a href="/A017355/b017355.txt">Table of n, a(n) for n = 0..10000</a>
%H A017355 <a href="/index/Rec#order_04">Index entries for linear recurrences with constant coefficients</a>, signature (4,-6,4,-1).
%F A017355 a(0)=343, a(1)=4913, a(2)=19683, a(3)=50653; for n>3, a(n) = 4*a(n-1) - 6*a(n-2) + 4*a(n-3) - a(n-4). - _Harvey P. Dale_, Jun 11 2015
%t A017355 (10 Range[0, 40] + 7)^3 (* or *) LinearRecurrence[{4, -6, 4, -1}, {343, 4913, 19683, 50653}, 40] (* _Harvey P. Dale_, Jun 11 2015 *)
%o A017355 (Magma) [(10*n+7)^3: n in [0..40]]; // _Vincenzo Librandi_, Aug 30 2011
%Y A017355 Cf. A272914, first comment. [From _Bruno Berselli_, May 26 2016]
%K A017355 nonn,easy
%O A017355 0,1
%A A017355 _N. J. A. Sloane_