200360130

Appears in sequences

• Convolution of Catalan numbers A000108 with Catalan numbers but C(0)=1 replaced by 3.at n=16A038629
• Largest squarefree number dividing n-th central binomial coefficient C(n,[ n/2 ]).at n=31A048633
• Maximum over k of the largest squarefree number dividing a value of binomial(n,k).at n=31A048681
• Numerator of binomial(2n,n)/(2n+1).at n=16A056616
• Largest squarefree number dividing central binomial coefficient A000984(n).at n=16A080397
• a(n) = lcm(1, 2, ..., 2n) / lcm(1, 2, ..., n).at n=16A093880
• The radical of the swinging factorial A056040 for odd indices.at n=15A163640
• The radical of the swinging factorial A056040.at n=31A163641
• a(n) = product of primes p such that p^k <= n < 2*p^k for some k >= 1.at n=31A366369
• a(n) = product of primes p such that p^k <= n < 2*p^k for some k >= 1.at n=32A366369
• a(n) = product of primes p such that p^k <= n < 2*p^k for some k >= 1.at n=33A366369
• a(1) = 1; for n > 1, a(n) = A055231(a(n-1) * n), where A055231(k) is the powerfree part of k.at n=30A368823