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 A261813 #12 Dec 06 2015 11:34:44 %S A261813 9,8,1,0,5,7,9,7,3,0,8,7,6,1,1,4,9,7,7,3,9,6,8,0,2,8,1,4,2,0,0,0,5,0, %T A261813 8,2,5,7,0,4,0,9,5,2,1,0,2,9,9,5,8,4,8,5,6,3,5,0,4,2,0,2,5,9,4,0,7,4, %U A261813 9,2,1,4,1,8,5,4,3,8,3,5,5,0,9,4,8,8,3,8,9,9,8,5,9,7,0,0,6,9,5,9,5,1,3,4,3 %N A261813 Decimal expansion of (Pi/4)^N*(N^N/N!)^2 for N = 3. %C A261813 The general expression is a lower bound (due to H. Minkowski) on the discriminant of a number field of degree N. %C A261813 The corresponding value for N = 2 matches A091476. %D A261813 B. Mazur, Algebraic Numbers, in The Princeton Companion to Mathematics, Editor T. Gowers, Princeton University Press, 2008, Section IV.1, page 330. %H A261813 Stanislav Sykora, <a href="/A261813/b261813.txt">Table of n, a(n) for n = 1..2000</a> %F A261813 Equals 81*Pi^3/256. %e A261813 9.8105797308761149773968028142000508257040952102995848563504202594... %t A261813 n = 3; First@ RealDigits[N[(Pi/4)^n (n^n/n!)^2, 120]] (* _Michael De Vlieger_, Nov 19 2015 *) %o A261813 (PARI) N=3;(Pi/4)^N*(N^N/N!)^2 %Y A261813 Cf. A000796, A091476 (N=2). %K A261813 nonn,cons %O A261813 1,1 %A A261813 _Stanislav Sykora_, Nov 19 2015