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 A016183 #31 Mar 15 2025 11:28:51 %S A016183 1,18,247,3060,36061,413478,4665907,52148520,579398521,6413737338, %T A016183 70833585967,781146772380,8606455783381,94767902627598, %U A016183 1043125151976427,11479124233250640,126303599496326641 %N A016183 Expansion of g.f. 1/((1-7*x)*(1-11*x)). %H A016183 <a href="/index/Rec#order_02">Index entries for linear recurrences with constant coefficients</a>, signature (18,-77). %F A016183 a(n) = (11^(n+1) - 7^(n+1))/4. - Al Hakanson (hawkuu(AT)gmail.com), Dec 31 2008; adapted to offset by _Michel Marcus_, Mar 09 2025 %F A016183 a(n) = 18*a(n-1) - 77*a(n-2). - _Philippe Deléham_, Jan 01 2009 %F A016183 a(n) = 11*a(n-1) + 7^n, a(0)=1. - _Vincenzo Librandi_, Feb 09 2011 %F A016183 From _Elmo R. Oliveira_, Mar 09 2025: (Start) %F A016183 E.g.f.: exp(7*x)*(11*exp(4*x) - 7)/4. %F A016183 a(n) = A139745(n+1)/4. (End) %Y A016183 Cf. A139745. %K A016183 nonn,easy %O A016183 0,2 %A A016183 _N. J. A. Sloane_