193154

Appears in sequences

• Number of unrooted triangulations with reflection symmetry of a disk with 2 internal nodes and n+3 nodes on the boundary.at n=18A005509
• A Catalan-like sequence.at n=12A054542
• A Catalan-like sequence.at n=11A054577
• a(n) = lcm(1, 2, ..., 2n) / lcm(1, 2, ..., n).at n=12A093880
• Numbers n such that n, n+1, and the sum of those two numbers each have 4 or more distinct prime factors.at n=23A168630
• a(1) = 1 and for any n > 1, if A330647(n) divides a(n-1) then a(n) = a(n-1) / A330647(n), otherwise a(n) = a(n-1) * A330647(n).at n=19A330648
• Number of linear intervals in the Tamari lattices.at n=9A344136
• a(n) = product of primes p such that p^k <= n < 2*p^k for some k >= 1.at n=23A366369
• a(n) = product of primes p such that p^k <= n < 2*p^k for some k >= 1.at n=24A366369