%I A004355
%S A004355 1,6,66,816,10626,142506,1947792,26978328,377348994,5317936260,
%T A004355 75394027566,1074082795968,15363284301456,220495674290430,
%U A004355 3173734438530120,45795673964460816,662252084388541314
%N A004355 Binomial coefficient C(6n,n).
%C A004355 a(n) is asymptotic to c/sqrt(n)*(46656/3125)^n with c=sqrt(3/5/Pi)=0.437019372236831628217354... 
               - Benoit Cloitre (benoit7848c(AT)orange.fr), Jan 23 2008
%D A004355 M. Abramowitz and I. A. Stegun, eds., Handbook of Mathematical Functions, 
               National Bureau of Standards Applied Math. Series 55, 1964 (and various 
               reprintings), p. 828.
%H A004355 T. D. Noe, <a href="b004355.txt">Table of n, a(n) for n=0..100</a>
%H A004355 M. Abramowitz and I. A. Stegun, eds., <a href="http://www.nrbook.com/
               abramowitz_and_stegun/">Handbook of Mathematical Functions</a>, National 
               Bureau of Standards, Applied Math. Series 55, Tenth Printing, 1972 
               [alternative scanned copy].
%Y A004355 Sequence in context: A165229 A127857 A127858 this_sequence A124862 A130977 
               A151832
%Y A004355 Adjacent sequences: A004352 A004353 A004354 this_sequence A004356 A004357 
               A004358
%K A004355 nonn,easy
%O A004355 0,2
%A A004355 N. J. A. Sloane (njas(AT)research.att.com).