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 A006210 M1132 #21 Jul 08 2025 16:43:14
%S A006210 0,1,2,4,8,16,34,72,154,336,738,1632,3640,8160,18384,41616,94560,
%T A006210 215600,493122,1130976,2600388,5992560,13838306,32016576,74203112,
%U A006210 172252080,400451282,932247360,2173035800,5071299968,11848259458,27710346528,64871460996
%N A006210 Generalized Fibonacci numbers D_{n,2}.
%D A006210 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
%H A006210 Lars Blomberg, <a href="/A006210/b006210.txt">Table of n, a(n) for n = 1..1000</a>
%H A006210 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 A006210 nonn
%O A006210 1,3
%A A006210 _N. J. A. Sloane_
%E A006210 Terms a(26) and beyond from _Lars Blomberg_, Oct 20 2016