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 A067405 #14 Mar 12 2023 12:41:04
%S A067405 1,9,225,5625,140625,3515625,87890625,2197265625,54931640625,
%T A067405 1373291015625,34332275390625,858306884765625,21457672119140625,
%U A067405 536441802978515625,13411045074462890625,335276126861572265625,8381903171539306640625,209547579288482666015625,5238689482212066650390625
%N A067405 Fifth column of triangle A067402.
%H A067405 <a href="/index/Rec#order_01">Index entries for linear recurrences with constant coefficients</a>, signature (25).
%F A067405 a(n) = A067402(n+4, 4).
%F A067405 a(n) = 9*25^(n-1), n>=1, a(0) = 1.
%F A067405 G.f.: (1-16*x)/(1-25*x).
%F A067405 E.g.f.: (16 + 9*exp(25*x))/25. - _Stefano Spezia_, Sep 30 2022
%t A067405 Join[{1},NestList[25#&,9,20]] (* _Harvey P. Dale_, Mar 12 2023 *)
%Y A067405 Cf. A067404 (fourth column), A067406 (sixth column), A009969 (powers of 25).
%Y A067405 Cf. A067402.
%K A067405 nonn,easy
%O A067405 0,2
%A A067405 _Wolfdieter Lang_, Jan 25 2002