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 A081800 #30 Mar 11 2018 13:23:14 %S A081800 2,1,8,7,6,9,1,2,6 %N A081800 Decimal expansion of atomic unit of velocity in SI units (meters/second). %C A081800 Original name: Decimal expansion of Bohr N1 velocity constant: V_n1 = 2.187691415844453*10^6 (m/sec). %H A081800 NIST, <a href="http://physics.nist.gov/cgi-bin/cuu/Value?auvel">CODATA Value: atomic unit of velocity</a> %F A081800 sqrt(H/m) where H = 4.359743...*10^-18 J is one Hartree and m = A081801. - _R. J. Mathar_, Feb 06 2009 %F A081800 V_n1 = alpha * c = A003673 * A003678. - _Omar E. Pol_, Nov 07 2013 %e A081800 2187691.26... m/s = 2187.69126... km/s. - _Omar E. Pol_, Nov 07 2013 %Y A081800 Cf. A003673, A003678, A081801, A229938. %K A081800 cons,nonn %O A081800 7,1 %A A081800 _Benoit Cloitre_, Apr 10 2003 %E A081800 Offset corrected by _R. J. Mathar_, Feb 06 2009 %E A081800 Updated and new name by _Omar E. Pol_, Mar 11 2018