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 A067409 #12 Nov 19 2024 14:57:20
%S A067409 1,17,1377,111537,9034497,731794257,59275334817,4801302120177,
%T A067409 388905471734337,31501343210481297,2551608800048985057,
%U A067409 206680312803967789617,16741105337121390958977,1356029532306832667677137,109838392116853446081848097,8896909761465129132629695857
%N A067409 Ninth column of triangle A067402.
%C A067409 The tenth column gives [1, 19, 1900, 190000, ...].
%H A067409 <a href="/index/Rec#order_01">Index entries for linear recurrences with constant coefficients</a>, signature (81).
%F A067409 a(n) = A067402(n+8, 8).
%F A067409 a(n) = 17*81^(n-1), n>=1, a(0) = 1.
%F A067409 G.f.: (1-64*x)/(1-81*x).
%F A067409 E.g.f.: (64 + 17*exp(81*x))/81. - _Stefano Spezia_, Sep 30 2022
%t A067409 Join[{1},NestList[81#&,17,15]] (* _Harvey P. Dale_, Nov 19 2024 *)
%Y A067409 Cf. A067408 (eighth column).
%Y A067409 Cf. A067402.
%K A067409 nonn,easy
%O A067409 0,2
%A A067409 _Wolfdieter Lang_, Jan 25 2002