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 A155606 #18 Jan 24 2017 23:22:19 %S A155606 1,10,72,538,4176,33010,262872,2099338,16783776,134237410,1073800872, %T A155606 8590111738,68720008176,549757408210,4398051294072,35184386437738, %U A155606 281475019757376,2251799942825410,18014398896902472,144115189238117338 %N A155606 a(n) = 8^n + 3^n - 1. %H A155606 <a href="/index/Rec#order_03">Index entries for linear recurrences with constant coefficients</a>, signature (12,-35,24). %F A155606 G.f.: 1/(1-8*x) + 1/(1-3*x) - 1/(1-x). %F A155606 E.g.f.: e^(8*x) + e^(3*x) - e^x. %F A155606 a(n) = 11*a(n-1) - 24*a(n-2) - 14 with a(0)=1, a(1)=10. - _Vincenzo Librandi_, Jul 21 2010 %e A155606 G.f. = 1 + 10*x + 72*x^2 + 538*x^3 + 4176*x^4 + 33010*x^5 + 262872*x^6 + ... %p A155606 A155606:=n->8^n+3^n-1: seq(A155606(n), n=0..30); # _Wesley Ivan Hurt_, Jan 24 2017 %o A155606 (PARI) a(n)=8^n+3^n-1 \\ _Charles R Greathouse IV_, Jun 11 2015 %Y A155606 Cf. A155588, A155590, A155592, A155593, A155594, A155596, A155597, A155598, A155599, A155600, A155601, A155602, A155603, A155604, A155605. %K A155606 nonn,easy %O A155606 0,2 %A A155606 _Mohammad K. Azarian_, Jan 25 2009