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 A015385 #15 Sep 08 2022 08:44:39
%S A015385 1,-9847035132,105044442632566365137,-1113436927250681654567602842120,
%T A015385 11807854622717155763702496765310830475383,
%U A015385 -125216049699851612689080581288579246248342359563916
%N A015385 Gaussian binomial coefficient [ n,9 ] for q=-13.
%D A015385 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 A015385 I. P. Goulden and D. M. Jackson, Combinatorial Enumeration. Wiley, NY, 1983, p. 99.
%D A015385 M. Sved, Gaussians and binomials, Ars. Combinatoria, 17A (1984), 325-351.
%H A015385 Vincenzo Librandi, <a href="/A015385/b015385.txt">Table of n, a(n) for n = 9..110</a>
%H A015385 <a href="/index/Ga#Gaussian_binomial_coefficients">Index entries related to Gaussian binomial coefficients</a>.
%F A015385 a(n) = Product_{i=1..9} ((-13)^(n-i+1)-1)/((-13)^i-1). - M. F. Hasler, Nov 03 2012
%t A015385 Table[QBinomial[n, 9, -13],{n, 9, 20}] (* _Vincenzo Librandi_, Nov 04 2012 *)
%o A015385 (PARI) A015385(n,r=9,q=-13)=prod(i=1,r,(q^(n-i+1)-1)/(q^i-1)) \\ _M. F. Hasler_, Nov 03 2012
%o A015385 (Magma) r:=9; q:=-13; [&*[(1-q^(n-i+1))/(1-q^i): i in [1..r]]: n in [r..20]]; // _Vincenzo Librandi_, Nov 04 2012
%Y A015385 Cf. Gaussian binomial coefficients [n,r] for q=-13: A015265 (r=2), A015286 (r=3), A015303 (r=4), A015321 (r=5), A015337 (r=6), A015355 (r=7), A015370 (r=8), A015402 (r=10), A015422 (r=11), A015438 (r=12). - _M. F. Hasler_, Nov 03 2012
%Y A015385 Cf. Gaussian binomial coefficients [n, 9] for q = -2..-13: A015371, A015375, A015376, A015377, A015378, A015379, A015380, A015381, A015382, A015383, A015384. - _Vincenzo Librandi_, Nov 04 2012
%K A015385 sign,easy
%O A015385 9,2
%A A015385 _Olivier Gérard_