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integer-sequences

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C++20 library and tools for Riordan posets: posets whose order relation is a binary Riordan matrix. Enumerates Riordan poset matrices, counts Riordan posets up to isomorphism (verified to n = 28), recognizes Riordan posets, and decides when a Riordan poset is infinite. Includes tests, data and independent verification.

  • Updated Oct 26, 2026
  • C++

Exhaustive enumeration of unlabeled Riordan graphs, i.e. graphs whose adjacency matrix is a Riordan array (g,f) over Z₂. Computes u(n) for n≤17 by two independent C++/nauty methods (a third for n≤10), lists every graph with its generating functions and matrices, and samples them uniformly. Data, logs and tests included for full reproducibility..

  • Updated Oct 27, 2026
  • C++

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