42411

Appears in sequences

• Number of ways to partition 1 into reduced fractions i/j with j <= n.at n=19A119983
• Volume of elliptic cone (rounded down) with semi-minor axis = height = n and semi-major axis = 3*n/2.at n=29A228391
• Bisection of A006950 (the odd part).at n=27A233759
• E.g.f. B = B(x,y) satisfies: A^2 + B^2 + C^2 = 1 + y^2 and A^3 + B^3 + C^3 = 1 + y^3, where functions A = A(x,y) and C = C(x,y) are described by A278885 and A278887, respectively.at n=72A278886
• E.g.f. C = C(x,y) satisfies: A^2 + B^2 + C^2 = 1 + y^2 and A^3 + B^3 + C^3 = 1 + y^3, where functions A = A(x,y) and B = B(x,y) are described by A278885 and A278886, respectively.at n=72A278887
• Central terms of triangles A278886 and A278887: a(n) = A278886(n,n) = A278887(n,n+1) for n>=0.at n=8A278889