14872858

Appears in sequences

• a(n) = (2n+3)!/(n!*(n+2)!).at n=10A000917
• Denominator of n * n-th harmonic number.at n=23A027611
• a(n) = floor((denominator of H(n))/n), where H(n) = Sum_{k=1..n} 1/k, the n-th harmonic number.at n=23A128438
• Number of valleys in all left factors of Dyck paths of length n. A valley is a (1,-1)-step followed by a (1,1)-step.at n=24A191522
• Number of turns in all left factors of Dyck paths of length n.at n=23A191527
• Denominators of r(n) = r(n-1) + r(n-2) + B_(n-2), where B_n is the n-th Bernoulli number A027641(n)/A027642(n).at n=25A228151
• a(n) = (n!*m)/(m!*(m+1)!) where m = floor(n/2).at n=23A237884
• Least k such that Sum_{i=1..n} k^n / i is a positive integer.at n=22A333196
• a(1) = 1; thereafter a(n) = a(n-1) / lpf(n) if lpf(n) divides a(n-1), otherwise a(n) = a(n-1) * lpf(n), where lpf is the least prime factor function A020639.at n=26A337643
• Records in A110765.at n=16A342125
• Denominator of sum of reciprocals of all prime divisors of all positive integers <= n.at n=26A380315