1352079

Appears in sequences

• Euler characteristics of polytopes.at n=23A006481
• a(n) = binomial(n, floor(n/2)) + 1.at n=23A051920
• Inverse Moebius transform of A001405 (binomial(n, floor(n/2))).at n=22A062798
• Number of congruence classes (epimorphisms/vertex partitionings induced by graph endomorphisms) of undirected cycles of even length: |C(C_{2*n})|.at n=11A112849
• a(n) = 5n^4 - 4n^3 + 3n^2 - 2n + 1.at n=23A131466
• Number of set partitions of {1, 2, ..., 2*n} with sizes in {[n, n], [2n]}.at n=12A260878
• First term of n-th difference sequence of (floor(k*r)), r = -sqrt(2), k >= 0.at n=23A325665
• a(n) is the smallest base b such that (b+1)^n in base b is a palindrome.at n=22A367857
• 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=11A383431