Geodesic
Chromatic Sums for Rooted Planar Triangulations, IV: The Case λ = ∞
Canadian journal of mathematics, Tome 25 (1973) no. 5, pp. 929-940

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The chromial P(M, λ) of a planar near-triangulation M has the leading term λv(M) , where v(M) is the number of vertices of M. The problem of finding the number of rooted planar near-triangulations of a given class S, all supposed to have the same number of vertices, can be regarded as a special case of the problem of finding chromatic sums. We can sum P(M, λ) over the members of S, divide by the appropriate power of λ and let λ → ∞. We thus get the sum of the coefficient of the leading term of P(M, λ) for all M ∈ S, that is we get the number of members of S. 
Tutte, W. T. Chromatic Sums for Rooted Planar Triangulations, IV: The Case λ = ∞. Canadian journal of mathematics, Tome 25 (1973) no. 5, pp. 929-940. doi: 10.4153/CJM-1973-099-9
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