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 A015260 #25 Sep 08 2022 08:44:39
%S A015260 1,73,5986,484210,39226915,3177326971,257363962948,20846476694116,
%T A015260 1688564650965445,136773736379522605,11078672649879436966,
%U A015260 897372484611991440598,72687171253825493271271,5887660871557577275727455,476900530596184348447133320
%N A015260 Gaussian binomial coefficient [ n,2 ] for q = -9.
%D A015260 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 A015260 I. P. Goulden and D. M. Jackson, Combinatorial Enumeration. Wiley, NY, 1983, p. 99.
%D A015260 M. Sved, Gaussians and binomials, Ars. Combinatoria, 17A (1984), 325-351.
%H A015260 Vincenzo Librandi, <a href="/A015260/b015260.txt">Table of n, a(n) for n = 2..200</a>
%H A015260 <a href="/index/Rec#order_03">Index entries for linear recurrences with constant coefficients</a>, signature (73, 657, -729).
%F A015260 G.f.: x^2/((1-x)*(1+9*x)*(1-81*x)).
%F A015260 a(2) = 1, a(3) = 73, a(4) = 5986, a(n) = 73*a(n-1) + 657*a(n-2) - 729*a(n-3). - _Vincenzo Librandi_, Oct 27 2012
%t A015260 Table[QBinomial[n, 2, -9], {n, 2, 20}] (* _Vincenzo Librandi_, Oct 27 2012 *)
%o A015260 (Sage) [gaussian_binomial(n,2,-9) for n in range(2,15)] # _Zerinvary Lajos_, May 27 2009
%o A015260 (Magma) I:=[1, 73, 5986]; [n le 3 select I[n] else 73*Self(n-1) + 657*Self(n-2) - 729*Self(n-3): n in [1..20]]; // _Vincenzo Librandi_, Oct 27 2012
%K A015260 nonn,easy
%O A015260 2,2
%A A015260 _Olivier Gérard_, Dec 11 1999