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 A046982 #15 May 21 2023 19:18:09
%S A046982 1,2,2,8,10,64,244,2176,554,31744,202084,2830336,2162212,178946048,
%T A046982 1594887848,30460116992,7756604858,839461371904,9619518701764,
%U A046982 232711080902656,59259390118004,39611984424992768,554790995145103208,955693069653508096
%N A046982 Numerators of Taylor series for tan(x + Pi/4).
%D A046982 G. W. Caunt, Infinitesimal Calculus, Oxford Univ. Press, 1914, p. 477.
%H A046982 T. D. Noe, <a href="/A046982/b046982.txt">Table of n, a(n) for n=0..100</a>
%e A046982 1 + 2*x + 2*x^2 + (8/3)*x^3 + (10/3)*x^4 + (64/15)*x^5 + (244/45)*x^6 + ...
%t A046982 nmax = 23; t[0, 1] = 1; t[0, _] = 0; t[n_, k_] := t[n, k] = (k-1)*t[n-1, k-1] + (k+1)*t[n-1, k+1]; Numerator[ Table[ Sum[ t[n, k]/n!, {k, 0, n+1}], {n, 0, nmax} ]] (* _Jean-François Alcover_, Nov 09 2011 *)
%t A046982 CoefficientList[Series[Tan[x+Pi/4],{x,0,30}],x]//Numerator (* _Harvey P. Dale_, May 21 2023 *)
%Y A046982 Cf. A046983.
%Y A046982 a(n) = 2^k * A050970(n), for some k>=0 (conjectured).
%K A046982 nonn,frac,easy,nice
%O A046982 0,2
%A A046982 _N. J. A. Sloane_