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 A155648 #24 Jan 06 2024 21:55:56
%S A155648 1,15,135,1215,11295,107775,1046655,10279935,101679615,1010077695,
%T A155648 10060466175,100362797055,1002176782335,10013060694015,
%U A155648 100078364164095,1000470184984575,10002821109907455,100016926659444735
%N A155648 a(n) = 10^n + 6^n - 1.
%H A155648 <a href="/index/Rec#order_03">Index entries for linear recurrences with constant coefficients</a>, signature (17,-76,60).
%F A155648 G.f.: 1/(1-10*x) + 1/(1-6*x) - 1/(1-x).
%F A155648 E.g.f.: e^(10*x) + e^(6*x) - e^x.
%F A155648 a(n) = 16*a(n-1) - 60*a(n-2) - 45; a(0)=1, a(1)=15. - _Vincenzo Librandi_, Jul 21 2010
%F A155648 a(n) = 17*a(n-1) - 76*a(n-2) + 60*a(n-3); a(0)=1, a(1)=15, a(2)=135. - _Harvey P. Dale_, Mar 30 2014
%t A155648 Table[10^n+6^n-1,{n,0,20}] (* or *) LinearRecurrence[{17,-76,60},{1,15,135},20] (* _Harvey P. Dale_, Mar 30 2014 *)
%o A155648 (PARI) a(n)=10^n+6^n-1 \\ _Charles R Greathouse IV_, Sep 24 2015
%o A155648 (Magma) [10^n + 6^n - 1 : n in [0..20]]; // _Wesley Ivan Hurt_, Jan 06 2024
%Y A155648 Cf. A155628, A155629, A155630, A155631, A155632, A155633, A155634, A155635, A155636, A155637, A155638, A155639, A155640, A155641, A155642, A155643, A155644, A155645, A155646, A155647.
%K A155648 nonn,easy
%O A155648 0,2
%A A155648 _Mohammad K. Azarian_, Jan 31 2009