%I #17 Feb 12 2024 06:36:14
%S 1,31,706,14206,267331,4823581,84557956,1451432956,24517448581,
%T 408951042331,6752105339206,110549175651706,1797251568229831,
%U 29043982525261081,466937872906120456,7473240118999870456
%N a(1)=1, a(n) = n*15^(n-1) + a(n-1).
%H <a href="/index/Rec#order_03">Index entries for linear recurrences with constant coefficients</a>, signature (31,-255,225).
%F G.f.: x/((1 - x)*(1 - 15*x)^2). - _Stefano Spezia_, Mar 11 2020
%o (PARI) a(n) = (1+15^n*(14*n-1))/196; \\ _Jinyuan Wang_, Mar 11 2020
%K nonn,easy
%O 1,2
%A _Olivier GĂ©rard_