257400

Appears in sequences

• Number of permutations of [n] in which the longest increasing run has length 6.at n=10A000467
• Triangle of unsigned 4-Lah numbers.at n=23A143499
• G.f. satisfies: A(x) = 1 + x*A(x)^2*A(2x).at n=6A168602
• a(n) = lcm(n^2, swinging_factorial(n)).at n=15A181860
• Numbers with prime factorization pqr^2s^2t^3.at n=8A190386
• Molecular topological indices of the crossed prism graphs.at n=21A192793
• Number of permutations of [2n+1] in which the longest increasing run has length n+1.at n=5A230251
• Value of x for solution of 5^n = x^2 + y^2 with closest x and y (n >= 0, 0 <= x < y).at n=16A236571
• Regular triangle T(n,k) = binomial(2*n-2*k,n-k)*((n+1)/k)*Sum_{k=0..floor((k-1)/2)} (-1)^k*binomial(2*k,k)*binomial(n+3*k-2*k,k-2*k-1), read by rows.at n=37A306625
• Coefficient triangle of generalized Laguerre polynomials n!*L(n,n+1,x) (rising powers of x).at n=23A343890
• The number of grains of sand in the identity element for the 3D sandpile group on an n X n X n cubic grid.at n=40A351379
• Expansion of (1/x) * Series_Reversion( x*(1-x)^4/(1-x+x^4) ).at n=7A366056