54488

Appears in sequences

• Number of subsets A of {1,2,...,n} with |A+A| = |A-A|.at n=18A118544
• Irregular triangle T(n, k) = ((-1)^(k+1)/2)*Sum_{j=0..n-2*k} binomial(n+2, j)*binomial(n+2, j+k+1)* binomial(n+2, j+2*k+2), read by rows.at n=13A158193
• a(n) = A293857(n)/A010551(n).at n=22A293984
• a(n) is the number of Q-bases which can be built from the set {log(1),...,log(n)}.at n=35A307984
• a(n) is the number of Q-bases which can be built from the set {log(1),...,log(n)}.at n=36A307984