102091

Appears in sequences

• Maximal number of regions obtained by joining n points around a circle by straight lines. Also number of regions in 4-space formed by n-1 hyperplanes.at n=40A000127
• Number of distributive lattices; also number of paths with n turns when light is reflected from 5 glass plates.at n=9A006358
• Place n equally-spaced points around a circle and join every pair of points by a chord; this divides the circle into a(n) regions.at n=40A006533
• 5-wave sequence.at n=40A038201
• First line of 5-wave sequence A038201, also bisection of A006358.at n=5A038261
• Expansion of x + 1/(-x - 1/(-x - 1/(-x - 1/(-x - 1/(-x + 1))))).at n=9A373569