52956

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=34A000127
• 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=34A006533
• Number of regions in regular n-gon with all diagonals drawn.at n=35A007678
• a(n) = Sum_{i=0..4} binomial(Fibonacci(n),i).at n=9A032439
• Number of Dyck paths of semilength n with no peak at height 3.at n=12A059019
• Numbers m such that N=(am+1)(bm+1)(cm+1) is a 3-Carmichael number (A087788), where a,b,c = 1,2,23.at n=6A064248
• Triangle read by rows: T(n,k) is the number of Dyck paths of semilength n that have k valleys at level 1.at n=57A114489
• Total number of parts in all overpartitions of n.at n=19A235792
• Numbers k such that (11*10^k + 19)/3 is prime.at n=34A270339
• Number of integer partitions of n whose omega-sequence does not cover an initial interval of positive integers.at n=42A325262
• Number of pairs of Dyck paths of semilength n such that the midpoint of the first is above the midpoint of the second.at n=7A355481