873180

Appears in sequences

• a(n) = A059366(n,n-2) = A059366(n,2) for n >= 2, where the triangle A059366 arises in the expansion of a trigonometric integral.at n=6A001194
• Unitary superperfect numbers: numbers n such that usigma(usigma(n)) = 2*n, where usigma(n) is the sum of unitary divisors of n (A034448).at n=14A038843
• Triangle T(m,s), m >= 0, 0 <= s <= m, arising in the computation of certain integrals.at n=38A059366
• Triangle T(m,s), m >= 0, 0 <= s <= m, arising in the computation of certain integrals.at n=42A059366
• A certain partition array in Abramowitz-Stegun order (A-St order).at n=46A134144
• Triangle of z Transform coefficients from General Pascal [1,8,1} A142458 polynomials multiplied by factor 3^Floor[(2*k - 1)/3].at n=40A167786
• a(n) = A203415(n+1)/A203415(n).at n=7A203416
• Triangle read by rows: number of idempotents of rank k in Brauer monoid B_n.at n=48A256036
• a(1) = 1. For n > 1, a(n) = a(n-1)/2 if a(n-1) is even, a(n) = a(n-1)*n otherwise.at n=24A290650
• a(n) = Product_{d|n, d<n} A019565(phi(d)), where phi is the Euler totient function A000010.at n=65A318834
• Triangle read by rows: T(n,k) is the number of achiral colorings of the facets of a regular n-dimensional orthotope using exactly k colors. Row n has 2n columns.at n=53A325011
• Expansion of e.g.f. (1 - x^2/2)^(-x).at n=11A351155
• Numbers k such that k and k+1 are both products of 2 triangular numbers.at n=31A356748
• Abundant numbers k such that k^2 + A033880(k)^2 is a perfect square.at n=11A377134