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 A247412 #11 Oct 28 2014 01:18:09 %S A247412 1,0,9,4,7,1,2,2,0,6,3,4,4,9,0,6,9,1,3,6,9,2,4,5,9,9,9,3,3,9,9,6,2,4, %T A247412 3,5,9,6,3,0,0,6,8,4,3,1,0,0,9,0,7,9,4,8,2,8,8,1,7,1,1,0,6,3,5,6,0,3, %U A247412 9,7,4,6,4,3,8,0,6,0 %N A247412 Decimal expansion of the tetrahedral angle (in degrees). %C A247412 Angle between chemical bonds in the sp^3 hybridization scheme. %C A247412 Angle between any two non-parallel bonds in a diamond crystal. %C A247412 For its value in radians and further comments, see A156546. %H A247412 Stanislav Sykora, <a href="/A247412/b247412.txt">Table of n, a(n) for n = 3..2000</a> %e A247412 109.4712206344906913692459993399624359630068431009079482881711063560... %t A247412 RealDigits[N[ArcCos[-1/3]*180/Pi, 100]][[1]] (* _Vaclav Kotesovec_, Sep 17 2014 *) %o A247412 (PARI) acos(-1/3)*180/Pi %Y A247412 Cf. A156546. %K A247412 nonn,cons,easy %O A247412 3,3 %A A247412 _Stanislav Sykora_, Sep 16 2014