A006401 -id:A006401 - cp's OEIS frontend

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A006400 Number of sensed simple planar maps with n edges and without vertices of degree 1.

Original entry on oeis.org

1, 0, 0, 1, 1, 2, 5, 11, 33, 117, 431, 1755, 7485

Offset: 0

N. J. A. Sloane

A simple planar map is a planar map without loops or parallel edges. - Andrew Howroyd, Jan 16 2025

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

Timothy R. Walsh, Generating nonisomorphic maps without storing them, SIAM J. Algebraic Discrete Methods 4 (1983), no. 2, 161-178.

Cf. A006384, A006388, A006394, A006401 (unsensed), A379436 (rooted).

a(11) and a(12) from Sean A. Irvine, Mar 30 2017

a(0)-a(2) prepended by Andrew Howroyd, Jan 14 2025

A379436 Number of rooted simple planar maps without vertices of degree 1.

Original entry on oeis.org

1, 0, 0, 1, 1, 6, 22, 92, 395, 1753

Offset: 0

Andrew Howroyd, Jan 14 2025

A simple planar map is without loops or parallel edges.

Cf. A006400 (sensed), A006401 (unsensed), A022558 (rooted simple planar maps), A379433.

Showing 1-2 of 2 results.