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 A006211 M1130 #21 Jul 08 2025 16:43:20
%S A006211 0,0,1,2,4,8,16,32,64,130,264,538,1104,2272,4692,9730,20236,42208,
%T A006211 88288,185126,389072,819458,1729296,3655936,7742124,16420928,34879040,
%U A006211 74185364,157986068,336845482,718988144,1536250336,3285674088,7033709954,15070204524
%N A006211 Generalized Fibonacci numbers D_{n,3}.
%D A006211 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
%H A006211 Lars Blomberg, <a href="/A006211/b006211.txt">Table of n, a(n) for n = 1..1000</a>
%H A006211 Bau-Sen Du, <a href="http://arXiv.org/abs/0706.2421">A Simple Method Which Generates Infinitely Many Congruence Identities</a>, Fib. Quart. 27 (1989), 116-124. See Table 2 p. 7.
%K A006211 nonn
%O A006211 1,4
%A A006211 _N. J. A. Sloane_
%E A006211 Terms a(26) and beyond from _Lars Blomberg_, Oct 20 2016