2032128

Appears in sequences

• Triangle, read by rows: T(n,k) = (1/2)*Sum_{j=0..2^n-1} j^k for k=0..n-1, n>=1; related to the Prouhet-Tarry-Escott problem.at n=18A140047
• Triangle T(n,p) read by rows: the order of the semigroup of orientation-preserving partial transformations of n elements with height p.at n=49A289711
• a(n) = Product_{d|n} lcm(d, sigma(d)) where sigma(k) is the sum of divisors of k (A000203).at n=11A334805
• a(n) = n! a(n-1) / a(n-2), where a(0) = 1, a(1) = 1.at n=9A372993
• a(n) = n! a(n-1) / a(n-2), where a(0) = 1, a(1) = 2.at n=9A372994