705430

Appears in sequences

• Number of 2n-bead black-white strings with n black beads and fundamental period 2n.at n=11A007727
• Number of different ways to select n elements from two sets of n elements under the precondition of choosing at least one element from each set.at n=10A115112
• A115112 with initial term changed from 0 to 1.at n=10A171074
• a(n) = binomial(n, [n/2]) - 2.at n=22A201686
• Sum of successive absolute differences of the binomial coefficients = 2*A014495(n).at n=21A218008
• Number of permutations of [n] having a shortest ascending run of length 10.at n=11A228677
• a(n) = Sum_{k=1..n, gcd(n,k) = 1} binomial(n,k)^2.at n=10A337003