A Remark on the Erdős-Szekeres Theorem

Combin. Theory (A) 42 (1986) 15–30. 6. D. Foata, Enumerating k-trees, Discrete Math. 1 (1971) 181–186. 7. J. Hage, Enumerating submultisets of multisets, Inf. Proc. Letters 85 (2003) 221–226. 8. J. W. Moon, Various proofs of Cayley’s formula for counting trees, in A Seminar on Graph Theory, F. Harary, ed., Holt, New York, 1967, pp. 70–78. 9. H. Prüfer, Neuer Beweis eines Satzes über Permutationen, Arch. Math. Phys. 27 (1918) 142–144.