290845350

Appears in sequences

• a(1)=1; for n >= 1, a(n+1) = lcm(a(n),n) / gcd(a(n),n).at n=29A008339
• Expansion of 1/(1-4*x)^(15/2).at n=8A020926
• a(n) = number of (s(0), s(1), ..., s(n)) such that s(i) is a nonnegative integer and |s(i) - s(i-1)| = 1 for i = 1,2,...,n and s(0) = 3. Also a(n) = Sum{T(n,k), k = 0,1,...,[ (n+3)/2 ]}, where T is defined in A026022.at n=29A026023
• a(1) = 1, a(n) = lcm(n, a(n-1)) / gcd(n, a(n-1)).at n=28A077139
• a(n) = 2 * C(2*n,n-1).at n=15A162551
• Second column of the extended Catalan triangle A189231.at n=30A238452
• Convolution of the generalized Catalan numbers A057977 with themselves.at n=29A239453
• Lexicographically earliest sequence such that for any n>1, n=u*v, where u/v = a(n)/a(n-1) in reduced form.at n=28A260850
• a(n) is the number of ballot sequences of length n tied or won by at most 3 votes.at n=29A337500
• A260850 sorted into increasing order and duplicates omitted.at n=29A370974