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 A323984 #16 Feb 11 2025 14:25:13
%S A323984 1,6,8,8,0,9,1,7,9,4,9,6,4,4,6,8,6,0,0,6,1,6,8,4,7,6,2,8,0,9,6,7,8,2,
%T A323984 2,9,4,1,1,9,6,8,1,1,8,9,2,8,7,1,8,2,3,1,2,5,6,8,4,0,5,6,0,7,8,8,8,9,
%U A323984 4,3,3,9,3,1,6,9,6,6,2,8,0,2,0,4,2,3,2,3,4,8,0,9,5,9,6,7,5,8,6,0,6,0,0,2,0,7,5,7,3,2,3
%N A323984 Decimal expansion of exp(Pi/6).
%H A323984 Robert G. Wilson v, <a href="/A323984/b323984.txt">Table of n, a(n) for n = 1..1000</a>
%H A323984 H. S. Uhler, <a href="http://www.jstor.org/stable/2972387">On the numerical value of i^i</a>, Amer. Math. Monthly, 28 (1921), 114-116.
%H A323984 <a href="/index/Tra#transcendental">Index entries for transcendental numbers</a>.
%F A323984 A323982 + A323983 = A323984.
%e A323984 1.6880917949644686006168476280967822941196811892871823125684056078889433931696...
%t A323984 RealDigits[Exp[Pi/6], 10, 111][[1]] (* or *)
%t A323984 a[0] = a[1] = 1; a[n_] := ((n - 2)^2 + 1) a[n - 2]; t[x_] := N[(1/2)^x*a[x]/x!, 128]; RealDigits[Sum[t[x], {x, 0, 421}], 10, 111][[1]] (* _Robert G. Wilson v_, Feb 16 2019 *)
%Y A323984 Cf. A323982, A323983, A323985, A323986, A323987.
%K A323984 nonn,cons
%O A323984 1,2
%A A323984 _N. J. A. Sloane_, Feb 11 2019
%E A323984 Corrected and extended by _Robert G. Wilson v_, Feb 16 2019