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%I #13 Dec 19 2022 09:38:02
%S 1,1,4,22,266,2218,58100,644828,20949776,502226904,20622109728,
%T 339816568512,29770028441472,568704136553760,31544507027061120,
%U 1864702918415957568,150882403284582339072,3672279699978976000896,458988841789031457035136,12369374876487501375431040
%N a(n) is the permanent of the n X n matrix M(n) that is defined by M[i,j] = sigma(gcd(i,j)).
%o (PARI) a(n) = matpermanent(matrix(n, n, i, j, sigma(gcd(i,j))));
%Y Cf. A000142 (determinant), A134866 (matrix).
%K nonn
%O 0,3
%A _Michel Marcus_, Dec 18 2022
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