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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.

A380620 Number of unsensed combinatorial maps with n edges and 2 vertices.

Original entry on oeis.org

1, 2, 8, 33, 198, 1571, 16431, 213831, 3288821
Offset: 1

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Author

Andrew Howroyd, Jan 28 2025

Keywords

Comments

By duality, also the number of unsensed combinatorial maps with n edges and 2 faces.

Crossrefs

Column 2 of A380616.
Cf. A380239 (planar), A380618 (sensed), A380621 (3 vertices).

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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