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 A164094 #21 May 19 2019 17:23:59 %S A164094 5,8,14,26,50,98,194,386,770,1538,3074,6146,12290,24578,49154,98306, %T A164094 196610,393218,786434,1572866,3145730,6291458,12582914,25165826, %U A164094 50331650,100663298,201326594,402653186,805306370,1610612738,3221225474 %N A164094 a(n) = 3*2^n + 2. %H A164094 Vincenzo Librandi, <a href="/A164094/b164094.txt">Table of n, a(n) for n = 0..1000</a> %H A164094 <a href="/index/Rec#order_02">Index entries for linear recurrences with constant coefficients</a>, signature (3,-2). %F A164094 a(n) = A007283(n) + 2 = 3*a(n-1) - 2*a(n-2). %F A164094 G.f.: (5-7*x)/((2*x-1)*(x-1)). %t A164094 #+2&/@(3 2^Range[0,30]) (* _Harvey P. Dale_, Jan 23 2011 *) %o A164094 (PARI) a(n)= 3<<n+2 \\ _Charles R Greathouse IV_, Jan 11 2012 %Y A164094 Cf. A007283. %K A164094 nonn,easy %O A164094 0,1 %A A164094 _Vincenzo Librandi_, Aug 10 2009 %E A164094 Offset corrected by _R. J. Mathar_, Aug 21 2009