199485

Appears in sequences

• Third elementary symmetric function of 3,4,...,n+4.at n=10A024184
• Generalized centered polygonal numbers.at n=25A081282
• Expansion of x*(-1+3*x-5*x^2+4*x^3+2*x^4+2*x^6) / ((x-1)*(2*x^4-4*x^3+3*x^2-3*x+1)*(x^4-2*x^3+2*x^2+1)).at n=17A110151
• Number of nX3 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 2,2,1,0,0 for x=0,1,2,3,4.at n=8A197175
• a(n) = sigma(2*n) * binomial(2*n,n)/2, for n >= 1.at n=7A322185
• Denominators of the partial sums of the reciprocals of the unitary totient function (A047994).at n=33A379518
• Denominators of the partial sums of the reciprocals of the unitary totient function (A047994).at n=36A379518