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 A193577 #19 Feb 18 2025 08:17:28 %S A193577 5,35,245,1715,12005,84035,588245,4117715,28824005,201768035, %T A193577 1412376245,9886633715,69206436005,484445052035,3391115364245, %U A193577 23737807549715,166164652848005,1163152569936035,8142067989552245,56994475926865715 %N A193577 a(n) = 5*7^n. %H A193577 Vincenzo Librandi, <a href="/A193577/b193577.txt">Table of n, a(n) for n = 0..1000</a> %H A193577 <a href="/index/Rec#order_01">Index entries for linear recurrences with constant coefficients</a>, signature (7). %F A193577 G.f.: 5/(1-7*x). %F A193577 a(n) = 7*a(n-1), a(0)=5. %t A193577 5 7^Range[0,20] (* or *) NestList[7#&,5,20] (* _Harvey P. Dale_, Dec 10 2017 *) %o A193577 (Magma) [5*7^n: n in [0..20]]; %Y A193577 Cf. A005055. %Y A193577 Cf. A169634, A000420. %K A193577 nonn,easy %O A193577 0,1 %A A193577 _Vincenzo Librandi_, Sep 15 2011