OEIS A000257: Rooted Bicubic Map Enumeration

We explore OEIS sequence A000257, the Rooted Bicubic Map Enumeration. From rooted bicubic maps to Eulerian planar maps, indecomposable 1342-avoiding permutations, and Tamari-lattice intervals, we uncover how one sequence ties together diverse corners of combinatorics. We’ll also touch on its Catalan-number connection, generating functions, and its clean asymptotic growth, highlighting why these numbers serve as a shared fingerprint across multiple mathematical worlds.

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