Is there a Mathematica built-in function for the calculation of the Hafnian of a matrix? I am interested in the function as it appears naturally in the calculation of moments of a multivariate Gaussian distribution.
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3$\begingroup$ I guess an enterprising soul might be interested in implementing this in Mathematica. $\endgroup$ – J. M.'s technical difficulties♦ Nov 19 '19 at 12:15
