18878

Appears in sequences

• Number of different absolute values of vector sums generated by n vectors chosen from 2n (equally spaced) points around the unit circle. Dipole moments of n positive and n negative equally spaced charges on a circle.at n=14A077078
• Number of polyominoes of order 2n that can be tiled by dominoes in a unique way.at n=5A213377
• a(n) = Sum_{k=0..floor(n/4)} binomial(n-1-3*k,n-4*k) * binomial(2*k,k).at n=23A360310