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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

User: Jesse Selover

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Jesse Selover has authored 1 sequences.

A375346 Number of orientations of the uniform Lagrangian matroid on n elements.

Original entry on oeis.org

1, 6, 38, 990, 395094, 33433683534
Offset: 1

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Author

Jesse Selover, Aug 12 2024

Keywords

Comments

a(n) is the number of functions F from the powerset of {1, ..., n} to {-1, +1} with F(empty set) = +1 and satisfying the constraint: F({i} union S) != F({j} union S) => F(S) != F({i,j} union S) for any subset S and distinct i,j not in S.

Links

Crossrefs

Cf. A307334.

Formula

a(n) = (1/3) * A307334(n) for n >= 2. - Tobias Boege, Jan 22 2025

Extensions

a(6) from Tobias Boege, Jan 22 2025

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