739024

Appears in sequences

• Denominator of n * n-th harmonic number.at n=20A027611
• a(n) = Sum_{j=0..n} A047072(j, n-j).at n=22A047073
• a(1) = 1. a(n) = n*a(n-1) if gcd(n,a(n-1)) = 1, a(n-1)/n if n divides a(n-1), otherwise a(n) = a(n-1).at n=20A068629
• Even terms in A118854.at n=16A118855
• Denominator of 1^n/n + 2^n/(n-1) + 3^n/(n-2) + ... + (n-1)^n/2 + n^n/1.at n=19A120487
• a(n) = 4*C(2n,n) - 3*0^n.at n=10A146534
• G.f. A(x) satisfies A(x) = 1 + 4*x*A(x)^(3/2).at n=7A214377
• Number of sawtooth patterns of length 1 in all Dyck paths of semilength n.at n=12A225015
• Minimal possible denominator for a sum of the form 1 +/- 1/2 +/- 1/3 +/- ... +/- 1/n.at n=20A232090
• Minimal possible denominator for a sum of the form 1 +/- 1/2 +/- 1/3 +/- ... +/- 1/n.at n=21A232090
• Oscillating orbitals over n sectors (nonpositive values indicating there exist none).at n=19A232500
• Denominator of Sum_{i=1..n} n^i/i.at n=20A237873
• a(n) = 4*(2*n)! / (n!)^2.at n=10A240530
• Number of permutations of length n such that numbers at odd positions are monotone and numbers at even positions are also monotone.at n=20A257546
• a(0) = 1; for n >= 1, a(n) = A059897(n, a(n-1)).at n=20A284567