GCD(k,j) Product

[N. J. A. Sloane]

I added this, just to get the ball rolling:


%I A072410
%S A072410 1,1,2,6,96,480,414720,2903040,5945425920,4334215495680,277389791723520000,
%T A072410 3051287708958720000,437332621360674939863040000,5685324077688774218219520000,
%U A072410 15974941971638268369709427589120000,982608696336737613503095822614528000000000
%N A072410 Product_{j=1..n} Product_{k=1..n} gcd(j,k).
%O A072410 0,3
%K A072410 nonn
%Y A072410 Cf. A018806.
%p A072410 f:=n->mul(mul(gcd(j,k),k=1..n),j=1..n);
%A A072410 njas, based on a suggestion from Leroy Quet, Feb 03 2004