20058301

Properties

Appears in sequences

• Euler characteristics of polytopes.at n=27A006481
• a(n) = binomial(n, floor(n/2)) + 1.at n=27A051920
• List of primes p which are equal to a central binomial coefficient C(n,floor(n/2)) plus 1.at n=9A066749
• Number of congruence classes (epimorphisms/vertex partitionings induced by graph endomorphisms) of undirected cycles of even length: |C(C_{2*n})|.at n=13A112849
• Primes of the form (2*n)!/(2*(n!)^2)+1.at n=4A112864
• Number of set partitions of {1, 2, ..., 2*n} with sizes in {[n, n], [2n]}.at n=14A260878
• First term of n-th difference sequence of (floor(k*r)), r = sqrt(7), k >= 0.at n=27A325672
• First term of n-th difference sequence of (floor(e*k/2)), k >= 0.at n=27A325738
• a(n) is the smallest base b such that (b+1)^n in base b is a palindrome.at n=26A367857
• a(n) is the denominator of tanh(Sum_{k=1..n-1} artanh(k/n)), where artanh is the inverse hyperbolic tangent function.at n=13A383431
• Prime numbersat n=1274099