cp's OEIS Frontend

A191658 Table, by rows, of denominators of alpha-coefficients in the symmetrized product of 2n Dirac matrices with two tensor indices.

%I A191658 #6 Mar 30 2012 18:40:59
%S A191658 1,2,3,6,3,45,4,3,9,45,315,120,9,9,45,135,315,14175,720,36,9,81,135,
%T A191658 135,2025,315,945,14175,467775,5040,180,27,81,135,135,405,2025,945,
%U A191658 945,14175,14175,42525,467775,42567525
%N A191658 Table, by rows, of denominators of alpha-coefficients in the symmetrized product of 2n Dirac matrices with two tensor indices.
%C A191658 The numerators are A191657. From table 1 by Izaurieta et al.
%H A191658 Fernando Izaurieta, Ricardo Ramírez, Eduardo Rodríguez, <a href="http://arxiv.org/abs/1106.1648">An efficient algorithm for the computation of the trace of the symmetrized product of an arbitrary number of Dirac matrices with two indices</a>, arXiv:1106.1648, June 08 2011.
%e A191658 The coefficients corresponding to each partition of 4 are:
%e A191658 1 + 1 + 1 + 1 -> 1/24;
%e A191658 2 + 1 + 1 -> -1/3;
%e A191658 2 + 2 -> 2/9;
%e A191658 3 + 1 -> 32/45;
%e A191658 4 -> -272/315.
%Y A191658 Cf. A191657.
%K A191658 nonn,frac,tabf
%O A191658 1,2
%A A191658 _Jonathan Vos Post_, Jun 10 2011