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 A296728 #11 Dec 19 2017 16:23:52
%S A296728 1,-2,-16,8,12672,571264,-44351360,-12355211520,-452681248768,
%T A296728 478190483394560,132554796040912896,-18854516962334277632,
%U A296728 -27186884683859043123200,-5502410397289951851773952,6273206188133923322747420672,5389680791235134726930445369344
%N A296728 Expansion of e.g.f. arcsin(x*cos(x)) (odd powers only).
%F A296728 a(n) = (2*n+1)! * [x^(2*n+1)] arcsin(x*cos(x)).
%e A296728 arcsin(x*cos(x)) = x/1! - 2*x^3/3! - 16*x^5/5! + 8*x^7/7! + 12672*x^9/9! + ...
%t A296728 nmax = 16; Table[(CoefficientList[Series[ArcSin[x Cos[x]], {x, 0, 2 nmax + 1}], x] Range[0, 2 nmax + 1]!)[[n]], {n, 2, 2 nmax, 2}]
%o A296728 (PARI) first(n) = x='x+O('x^(2*n)); vecextract(Vec(serlaplace(asin(x*cos(x)))), (4^n - 1)/3) \\ _Iain Fox_, Dec 19 2017
%Y A296728 Cf. A001818, A009015, A009016, A009446, A009447, A009633, A009634, A012495, A012780, A101928, A191512, A296464, A296466, A296679, A296680, A296729, A296730, A296731, A296740.
%K A296728 sign
%O A296728 0,2
%A A296728 _Ilya Gutkovskiy_, Dec 19 2017