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 A015217 #20 May 14 2019 14:59:43
%S A015217 1,2,27,1204,375629,400208358,2991792531583,76486991418728216,
%T A015217 13721923923633091909041,8419357054564884621321079882,
%U A015217 36250698926534384563556930107015907,533815775315492783921121148190498865117564
%N A015217 Sum of Gaussian binomial coefficients for q=24.
%D A015217 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 A015217 I. P. Goulden and D. M. Jackson, Combinatorial Enumeration. Wiley, NY, 1983, p. 99.
%D A015217 M. Sved, Gaussians and binomials, Ars. Combinatoria, 17A (1984), 325-351.
%H A015217 Vincenzo Librandi, <a href="/A015217/b015217.txt">Table of n, a(n) for n = 0..50</a>
%H A015217 Kent E. Morrison, <a href="https://cs.uwaterloo.ca/journals/JIS/VOL9/Morrison/morrison37.html">Integer Sequences and Matrices Over Finite Fields</a>, Journal of Integer Sequences, Vol. 9 (2006), Article 06.2.1.
%F A015217 a(0) = 1, a(1) = 2, a(n) = 2*a(n-1) + a(n-2)*((24^(n-1)) - 1). - _Vincenzo Librandi_, Nov 02 2012
%t A015217 Total/@Table[QBinomial[n, m, 24], {n, 0, 20}, {m, 0, n}] (* _Vincenzo Librandi_, Nov 02 2012 *)
%Y A015217 Row sums of triangle A022188.
%K A015217 nonn
%O A015217 0,2
%A A015217 _N. J. A. Sloane_, _Olivier Gérard_