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 A102651 #21 Mar 12 2024 12:57:28
%S A102651 4,12,24,48,96,196,392,784,1568,3140,6280,12560,25120,50244,100488,
%T A102651 200976,401952,803908,1607816,3215632,6431264,12862532,25725064,
%U A102651 51450128,102900256,205800516,411601032,823202064,1646404128,3292808260
%N A102651 a(n) = 4 * floor(23*2^n/15).
%C A102651 In binary, each term differs from the previous by a single bit.
%H A102651 <a href="/index/Rec#order_05">Index entries for linear recurrences with constant coefficients</a>, signature (2,0,0,1,-2)
%F A102651 G.f.: ( 4+4*x-4*x^4 ) / ( (x-1)*(2*x-1)*(1+x)*(x^2+1) ). - _R. J. Mathar_, Feb 20 2011
%p A102651 A102651:=n->4*floor(23*2^n/15); seq(A102651(n), n=0..50); # _Wesley Ivan Hurt_, Jan 21 2014
%t A102651 Table[4*Floor[23*2^n/15], {n, 0, 50}] (* _Wesley Ivan Hurt_, Jan 21 2014 *)
%o A102651 (PARI) a(n)=23<<n\15*4 \\ _Charles R Greathouse IV_, Feb 04 2016
%Y A102651 Cf. A102650, A102652, A102653.
%K A102651 easy,nonn,less
%O A102651 0,1
%A A102651 _Odimar Fabeny_, Feb 02 2005
%E A102651 Edited by _Don Reble_, Mar 28 2006