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 A259076 #20 Aug 15 2024 08:18:50 %S A259076 1,80,6400,512000,40960000,3276800000,262144000000,20971520000000, %T A259076 1677721600000000,134217728000000000,10737418240000000000, %U A259076 858993459200000000000,68719476736000000000000,5497558138880000000000000,439804651110400000000000000,35184372088832000000000000000 %N A259076 Powers of 80. %C A259076 Let T_n denote the n X n matrix with T_n(i,j) = 9^abs(i-j); then a(n) = abs(det(T_(n+1))). - _Lechoslaw Ratajczak_, Jun 17 2021 %H A259076 <a href="/index/Rec#order_01">Index entries for linear recurrences with constant coefficients</a>, signature (80). %F A259076 a(n) = A001018(n) * A011557(n). %F A259076 From _Elmo R. Oliveira_, Aug 14 2024: (Start) %F A259076 G.f.: 1/(1-80*x). %F A259076 E.g.f.: exp(80*x). %F A259076 a(n) = 80*a(n-1), n > 0. (End) %o A259076 (PARI) a(n)=80^n \\ _Charles R Greathouse IV_, Jun 19 2015 %o A259076 (PARI) powers(80,8) \\ _Charles R Greathouse IV_, Jun 19 2015 %Y A259076 Cf. A001018, A011557. %K A259076 nonn,easy %O A259076 0,2 %A A259076 _Anders Wallberg_, Jun 18 2015 %E A259076 a(13)-a(15) from _Elmo R. Oliveira_, Aug 14 2024