3695120

Appears in sequences

• a(n) = 4*(2n+1)!/n!^2.at n=9A002011
• a(n+1) = a(n)/n if n|a(n) else a(n)*n, a(1) = 1.at n=19A008336
• a(n) = (n + 1)*binomial(n + 1, 10).at n=10A027770
• Least common multiple of integers less than and prime to n.at n=20A038610
• Denominator of Sum_{1<=k<=n, gcd(k,n)=1} 1/k.at n=20A069220
• a(n) = LCM of the integers, from n/2 to n, which are coprime to n.at n=20A124444
• Denominator of the polynomial A_l(x) = sum_{d=1..l-1} x^(l-d)/d for index l=2n+1 evaluated at x=3.at n=9A145614
• Denominator of the polynomial A_i(x) = Sum_{d=1..i-1} x^(i-d)/d for index i=2n+1 evaluated at x=7.at n=10A145622
• Sum of squared terms in rows of triangle A152547: a(n) = Sum_{k=0..C(n,[n/2])-1} A152547(n,k)^2.at n=19A152548
• Product of Fibonacci and Catalan numbers: a(n) = A000045(2*n+2)*A000108(n).at n=8A215931
• Denominator of sum of fractions A182972(k) / A182973(k) such that A182972(k) + A182973(k) = n.at n=18A245678
• a(n) = 2^n * Sum_{k=0..n} Product_{j=1..k} (2/j)^((-1)^j).at n=18A328002
• Denominators of the partial sums of the Möbius transform of the harmonic numbers.at n=21A334313
• A008336 sorted and duplicates removed.at n=20A370968
• a(n) = n*binomial(n, n/2) if n is even otherwise 2^(n-1)*binomial(n-1, (n-1)/2).at n=20A389423