45741281820
domain: N
Appears in sequences
- Number of dissections of an n-gon, rooted at an exterior edge, asymmetric with respect to that edge.at n=22A000150
- Expansion of (1-4*x)^(3/2) in powers of x.at n=24A002421
- a(n) = C_n / 2 if n is even or ( C_n + C_((n-1)/2) ) / 2 if n is odd, where C = Catalan numbers (A000108).at n=21A007595
- a(n) = ((2n+1) + (2n-1) - 1)!/((2n+1)!*(2n-1)!).at n=11A065097
- Number of plane trees with n edges and having an odd number of leaves.at n=21A071684
- Number of plane trees with even number of leaves.at n=21A071688
- Numerators of even raw moments in the distribution of line lengths for lines picked at random in the unit disk.at n=21A093526
- Second column and subdiagonal of number triangle A098509.at n=22A098512
- Catalan numbers halved and rounded to the next integer.at n=22A130380
- Even Catalan numbers divided by 2.at n=17A152671
- Largest proper divisor of the Catalan number A000108(n).at n=20A152766
- Half-convolution of Catalan sequence A000108 with itself.at n=21A201204
- a(n) = binomial(2*(n+1),n) * gcd(n,2)/(2*(n+1)).at n=21A234040
- Number of ordered rooted trees with n nodes, most of which are leaves.at n=22A358585
- Number of ordered rooted trees with n nodes, at least half of which are leaves.at n=22A358586