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 A015349 #21 Sep 08 2022 08:44:39 %S A015349 1,-4304672,20846476694116,-99571465386311288480, %T A015349 476319830905927777714449130,-2278184404047301621409794099651808, %U A015349 10896505884544222754038383150470776581556,-52117638957586712017437457380440909324731738208 %N A015349 Gaussian binomial coefficient [ n,7 ] for q = -9. %D A015349 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 A015349 I. P. Goulden and D. M. Jackson, Combinatorial Enumeration. Wiley, NY, 1983, p. 99. %D A015349 M. Sved, Gaussians and binomials, Ars. Combinatoria, 17A (1984), 325-351. %H A015349 Vincenzo Librandi, <a href="/A015349/b015349.txt">Table of n, a(n) for n = 7..150</a> %t A015349 QBinomial[Range[7,20],7,-9] (* _Harvey P. Dale_, Dec 28 2011 *) %o A015349 (Sage) [gaussian_binomial(n,7,-9) for n in range(7,14)] # _Zerinvary Lajos_, May 27 2009 %o A015349 (Magma) r:=7; q:=-9; [&*[(1-q^(n-i+1))/(1-q^i): i in [1..r]]: n in [r..15]]; // _Vincenzo Librandi_, Nov 02 2012 %K A015349 sign,easy %O A015349 7,2 %A A015349 _Olivier Gérard_, Dec 11 1999 %E A015349 One more term from _Harvey P. Dale_, Dec 28 2011