684784

Appears in sequences

• Numerators of coefficients in expansion of x^-2*(1-exp(-2*x))^2.at n=20A104042
• a(n) = floor((2^n)/(2n-1)).at n=24A191631
• Number of subsets of {1, 3, ..., 2*n-1} which sum to 0 modulo 2*n-1.at n=24A334125