119700

Appears in sequences

• Number of nonseparable tree-rooted planar maps with n + 2 edges and 3 vertices.at n=17A006411
• Expansion of Product_{k>=1} (1 - x^k)^20.at n=18A010826
• Expansion of Product_{m>=1} (1+x^m)^10.at n=9A022575
• Numbers k such that (1/k) * Sum_{d|k} d*sigma(d) is an integer.at n=23A069520
• Triangle T(m,n) read by rows: T(m,n) = Sum_{k=1..n} StirlingS2(m, n) * StirlingS2(m, k).at n=25A167128
• Numbers with prime factorization pqr^2s^2t^2.at n=5A190379
• E.g.f.: Sum_{n>=0} 1/n! * Product_{k=1..n} ((1+x)^k - 1).at n=7A207649
• Triangle read by rows: coefficients of third-order hypergeometric-harmonic polynomials.at n=32A222063
• a(n) = (2*n+23)*n*(n-1), a coefficient appearing in the formula a(n)*Pi/324+n+1 giving the average number of regions into which n random planes divide the cube.at n=36A248598
• Numbers that are representable in at least two ways as sums of four distinct nonvanishing cubes.at n=21A259060
• Least number k such that the determinant of the circulant matrix formed by its decimal digits is equal to n*k.at n=2A323486
• a(n) is the number of subsets of {1..n} that contain exactly 4 odd and 1 even numbers.at n=41A333320
• Least k whose set of divisors contains exactly n quadruples (x, y, z, w) such that x^3 + y^3 + z^3 = w^3, or 0 if no such k exists.at n=26A337098
• Table read by rows, in which the n-th row lists all the primitive solutions k, in increasing order, such that k*sigma(k) = A337875(n).at n=42A337876