%I A055546
%S A055546 1,2,16,288,9216,460800,33177600,3251404800,416179814400,
%T A055546 67421129932800,13484225986560000,3263182688747520000,
%U A055546 939796614359285760000,317651255653438586880000
%V A055546 -1,2,-16,288,-9216,460800,-33177600,3251404800,-416179814400,
%W A055546 67421129932800,-13484225986560000,3263182688747520000,
%X A055546 -939796614359285760000,317651255653438586880000
%N A055546 (-1)^(n+1)*2^n*n!^2.
%C A055546 Coefficient of the Cayley-Menger determinant of order n.
%D A055546 A. L. Mackay, On the regular heptagon, J. Math. Chemistry, vol. 21, 1997, 
               197-209.
%H A055546 Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/
               Cayley-MengerDeterminant.html">Link to a section of The World of 
               Mathematics.</a>
%F A055546 E.g.f.: -arcsinh(x/sqrt(2))^2. - Vladeta Jovovic (vladeta(AT)eunet.rs), 
               Aug 30 2004
%t A055546 Table[(-1)^(n+1)2^n n!^2, {n, 0, 20}]
%Y A055546 Sequence in context: A102599 A123744 A136796 this_sequence A009549 A009795 
               A112722
%Y A055546 Adjacent sequences: A055543 A055544 A055545 this_sequence A055547 A055548 
               A055549
%K A055546 sign
%O A055546 0,2
%A A055546 Eric Weisstein (eric(AT)weisstein.com)