b1[m_,n_]:=总和[EulerPhi[c]*EulerPhi[d]*2^(m*n/LCM[c,d]),{c,除数[m]},{d,除数[n]}]/(4*m*n);
b2a[m_,n_]:=如果[OddQ[m],2^((m+1)*n/2)/(4*n),(2^;
b2b[m_,n_]:=除数和[n,如果[#>=2,EulerPhi[#]*2^((m*n)/#),0]&]/(4*n);
b2c[m_,n_]:=如果[OddQ[m],总和[If[OddQ[n/GCD[j,n]],2^((m+1)*GCD[j,n]/2)-2^(m*GCD[j,n]),0],{j,1,n-1}]/(4*n)2^(m*GCD[j,n]+1),0],{j,1,n-1}]/(8*n)];
b2[m,n]:=b2a[m,n]+b2b[m,n]+b2c[m,n];
b3[m,n]:=b2[n,m];b4oo[m,n]:=2^((m*n-3)/2);
b4eo[m,n]:=3*2^(m*n/2-3);b4ee[m,n]:=7*2^(m*n/2-4);
a[m_,n_]:=模[{b},If[OddQ[m],If[CodQ[n],b=b4oo[m,n],b=b4eo[m,n]],If[OddQ[n]、b=b4meo[m、n],b=b4ee[m,n]];b+=b1[m,n]+b2[m,n]+b3[m,n];返回[b]];
a[0]=1;a[n]:=a[n,n];
|