For 1 <= i,j <= n

c(p,i,j) = a(i,j) for p=1

c(p,i,j) = Sum(1<=k<=n, c(p-1,i,k) * c(p-1,k,j)) for p>1

Now it looks as if normal rules for factors of sums can be applied ...

Have a pleasant weekend,

Jens

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For 1 <= i,j <= n

c(p,i,j) = a(i,j) for p=1

c(p,i,j) = Sum(1<=k<=n, c(p-1,i,k) * c(p-1,k,j)) for p>1

Now it looks as if normal rules for factors of sums can be applied ...

Have a pleasant weekend,

Jens