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 A006109 M3917 #17 Feb 01 2018 21:18:40
%S A006109 1,1,5,21,357,5797,376805,24208613,6221613541,1594283908581,
%T A006109 1634141006295525,1673768626404966885,6857430062381149327845,
%U A006109 28089747579101385828291045,460250514083576206796548772325,7540859480106603961931048583270885
%N A006109 Gaussian binomial coefficient [ n,n/2 ] for q=4.
%D A006109 J. Goldman and G.-C. Rota, The number of subspaces of a vector space, pp. 75-83 of W. T. Tutte, editor, Recent Progress in Combinatorics. Academic Press, NY, 1969.
%D A006109 I. P. Goulden and D. M. Jackson, Combinatorial Enumeration. Wiley, NY, 1983, p. 99.
%D A006109 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
%D A006109 M. Sved, Gaussians and binomials, Ars. Combinatoria, 17A (1984), 325-351.
%H A006109 Vincenzo Librandi, <a href="/A006109/b006109.txt">Table of n, a(n) for n = 0..80</a>
%H A006109 M. Sved, <a href="/A006095/a006095.pdf">Gaussians and binomials</a>, Ars. Combinatoria, 17A (1984), 325-351. (Annotated scanned copy)
%t A006109 Table[QBinomial[n, Floor[n/2], 4], {n, 0, 20}] (* _Vincenzo Librandi_, Aug 13 2016 *)
%K A006109 nonn
%O A006109 0,3
%A A006109 _N. J. A. Sloane_