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 A015430 #19 Sep 08 2022 08:44:40
%S A015430 1,12111126301,171125943656551078651,2361717858885719498568905414551,
%T A015430 32702835678888952715367233418017870232604,
%U A015430 452622410329553863939387656214689217248493781677804
%N A015430 Gaussian binomial coefficient [ n,12 ] for q=-7.
%D A015430 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 A015430 I. P. Goulden and D. M. Jackson, Combinatorial Enumeration. Wiley, NY, 1983, p. 99.
%D A015430 M. Sved, Gaussians and binomials, Ars. Combinatoria, 17A (1984), 325-351.
%H A015430 Vincenzo Librandi, <a href="/A015430/b015430.txt">Table of n, a(n) for n = 12..110</a>
%F A015430 a(n) = Product_{i=1..12} ((-7)^(n-i+1)-1)/((-7)^i-1) (by definition). - _Vincenzo Librandi_, Nov 06 2012
%t A015430 Table[QBinomial[n, 12, -7], {n, 12, 20}] (* _Vincenzo Librandi_, Nov 06 2012 *)
%o A015430 (Sage) [gaussian_binomial(n,12,-7) for n in range(12,18)] # _Zerinvary Lajos_, May 28 2009
%o A015430 (Magma) r:=12; q:=-7; [&*[(1-q^(n-i+1))/(1-q^i): i in [1..r]]: n in [r..20]]; // _Vincenzo Librandi_, Nov 06 2012
%K A015430 nonn,easy
%O A015430 12,2
%A A015430 _Olivier Gérard_