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Published online by Cambridge University Press: 24 October 2008
The determinantal factor on p. 512 of Proc. Cambridge Philos. Soc. 61 (1965), should have the off-diagonal element in position (s, t) of the array multiplied by bst. This slip was pointed out to me by Dr Donald Knuth. When the rooted-labelled tree is not necessarily ‘chromatic,’ so that the bss's can be 1, the diagonal terms of the matrix become