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 A091683 #24 Feb 16 2025 08:32:52
%S A091683 1,1,7,8,4,0,3,2,5,8,2,4,6,1,7,6,7,1,8,3,0,1,0,0,7,6,2,5,4,6,7,9,1,5,
%T A091683 7,5,1,8,8,6,1,6,5,1,9,1,2,7,8,1,7,6,2,8,8,1,2,2,9,4,2,3,8,2,3,7,5,1,
%U A091683 6,3,8,2,7,1,2,9,2,6,6,0,6,3,6,2,3,3,5,5,9,8,1,5,2,6,8,1,2,8,0,1,0,4
%N A091683 Decimal expansion of HypergeometricPFQ[{1,1,1},{1/3,2/3},1/27].
%H A091683 Richard C. Schroeppel and Bill Gosper, <a href="https://web.archive.org/web/20240224184436/http://www.inwap.com/pdp10/hbaker/hakmem/series.html#item116">HACKMEM Item #116</a>
%H A091683 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/FactorialSums.html">Factorial Sums</a>
%F A091683 Equals Sum_{n>=0} (n!)^3/(3n)!.
%e A091683 1.17840325...
%t A091683 RealDigits[ N[ HypergeometricPFQ[{1, 1, 1}, {1/3, 2/3}, 1/27], 102]][[1]] (* _Jean-François Alcover_, Oct 29 2012 *)
%K A091683 nonn,cons
%O A091683 1,3
%A A091683 _Eric W. Weisstein_, Jan 28 2004
%E A091683 Link by _Charles R Greathouse IV_, Oct 26 2009