5200301

Appears in sequences

• Euler characteristics of polytopes.at n=25A006481
• a(n) = binomial(n, floor(n/2)) + 1.at n=25A051920
• Number of congruence classes (epimorphisms/vertex partitionings induced by graph endomorphisms) of undirected cycles of even length: |C(C_{2*n})|.at n=12A112849
• Alternating row sums of A257241, Stifel's version of the arithmetical triangle.at n=25A258144
• Number of set partitions of {1, 2, ..., 2*n} with sizes in {[n, n], [2n]}.at n=13A260878
• a(n) equals the coefficient of x^n in Sum_{m>=0} (x^m + 1/x^m)^m for n > 0.at n=24A304638
• a(n) equals the coefficient of x^(2*n-1) in Sum_{m>=0} (x^m + 1/x^m)^m for n >= 1.at n=12A316596
• a(n) = Sum_{d|n} binomial(d+n-1,n).at n=12A343548
• a(n) = Sum_{d|n} (n/d)^(d-1) * binomial(d+n-1,n).at n=12A363663
• a(n) = Sum_{d|n} (n/d)^(n-n/d) * binomial(d+n-1,n).at n=12A363664
• a(n) is the smallest base b such that (b+1)^n in base b is a palindrome.at n=24A367857
• a(n) = Sum_{d|n} binomial(2*d-1,d).at n=12A382503
• 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=12A383431